[evolution] Bug 202257 - Configurable folder tree sorting



commit 9fbf6aaaca537779b109a90c02677ce47f77172e
Author: Milan Crha <mcrha redhat com>
Date:   Fri Mar 15 12:53:43 2019 +0100

    Bug 202257 - Configurable folder tree sorting
    
    Closes https://bugzilla.gnome.org/show_bug.cgi?id=202257

 data/ui/evolution-mail.ui                    |   2 +
 po/POTFILES.in                               |   1 +
 src/mail/CMakeLists.txt                      |   2 +
 src/mail/e-mail-folder-sort-order-dialog.c   | 875 +++++++++++++++++++++++++++
 src/mail/e-mail-folder-sort-order-dialog.h   |  70 +++
 src/mail/e-mail-folder-tweaks.c              | 137 ++++-
 src/mail/e-mail-folder-tweaks.h              |  10 +
 src/mail/em-folder-tree-model.c              |  19 +-
 src/mail/em-folder-tree-model.h              |   1 +
 src/modules/mail/e-mail-shell-view-actions.c |  39 ++
 src/modules/mail/e-mail-shell-view-actions.h |   2 +
 src/modules/mail/e-mail-shell-view.c         |   4 +
 12 files changed, 1144 insertions(+), 18 deletions(-)
---
diff --git a/data/ui/evolution-mail.ui b/data/ui/evolution-mail.ui
index f2ff7aa391..1b2c1b3b68 100644
--- a/data/ui/evolution-mail.ui
+++ b/data/ui/evolution-mail.ui
@@ -48,6 +48,8 @@
         <menuitem action='mail-tools-subscriptions'/>
         <menuitem action='mail-folder-unsubscribe'/>
         <separator/>
+        <menuitem action='mail-folder-edit-sort-order'/>
+        <separator/>
         <menuitem action='mail-folder-copy'/>
         <menuitem action='mail-folder-move'/>
         <separator/>
diff --git a/po/POTFILES.in b/po/POTFILES.in
index ce24d12e0c..b9d5d9488f 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -333,6 +333,7 @@ src/mail/e-mail-config-welcome-page.c
 src/mail/e-mail-config-window.c
 src/mail/e-mail-display.c
 src/mail/e-mail-folder-create-dialog.c
+src/mail/e-mail-folder-sort-order-dialog.c
 src/mail/e-mail-free-form-exp.c
 src/mail/e-mail-junk-options.c
 src/mail/e-mail-label-dialog.c
diff --git a/src/mail/CMakeLists.txt b/src/mail/CMakeLists.txt
index fa60d1091d..a51c1ed251 100644
--- a/src/mail/CMakeLists.txt
+++ b/src/mail/CMakeLists.txt
@@ -66,6 +66,7 @@ set(SOURCES
        e-mail-display-popup-extension.c
        e-mail-folder-create-dialog.c
        e-mail-folder-pane.c
+       e-mail-folder-sort-order-dialog.c
        e-mail-folder-tweaks.c
        e-mail-free-form-exp.c
        e-mail-junk-options.c
@@ -155,6 +156,7 @@ set(HEADERS
        e-mail-enums.h
        e-mail-folder-create-dialog.h
        e-mail-folder-pane.h
+       e-mail-folder-sort-order-dialog.h
        e-mail-folder-tweaks.h
        e-mail-free-form-exp.h
        e-mail-junk-options.h
diff --git a/src/mail/e-mail-folder-sort-order-dialog.c b/src/mail/e-mail-folder-sort-order-dialog.c
new file mode 100644
index 0000000000..0b095f98ca
--- /dev/null
+++ b/src/mail/e-mail-folder-sort-order-dialog.c
@@ -0,0 +1,875 @@
+/*
+ * Copyright (C) 2019 Red Hat, Inc. (www.redhat.com)
+ *
+ * This library is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "evolution-config.h"
+
+#include <glib/gi18n-lib.h>
+#include <gtk/gtk.h>
+
+#include "em-folder-tree.h"
+#include "em-folder-tree-model.h"
+
+#include "e-mail-folder-sort-order-dialog.h"
+
+struct _EMailFolderSortOrderDialogPrivate {
+       CamelStore *store;
+       gchar *folder_uri;
+
+       GtkWidget *folder_tree;
+
+       guint autoscroll_id;
+       GtkTreeRowReference *drag_row;
+       gboolean drag_changed;
+       GHashTable *drag_state; /* gchar *folder_uri ~> guint sort_order */
+
+       GtkAction *reset_current_level_action;
+};
+
+enum {
+       PROP_0,
+       PROP_FOLDER_URI,
+       PROP_STORE
+};
+
+static void
+e_mail_folder_sort_order_dialog_alert_sink_init (EAlertSinkInterface *interface);
+
+G_DEFINE_TYPE_WITH_CODE (EMailFolderSortOrderDialog, e_mail_folder_sort_order_dialog, GTK_TYPE_DIALOG,
+       G_IMPLEMENT_INTERFACE (E_TYPE_ALERT_SINK, e_mail_folder_sort_order_dialog_alert_sink_init))
+
+static void
+sort_order_dialog_selection_changed_cb (GtkTreeSelection *selection,
+                                       gpointer user_data)
+{
+       EMailFolderSortOrderDialog *dialog = user_data;
+       GtkTreeModel *model;
+       GtkTreeIter iter, parent;
+       gboolean can;
+
+       g_return_if_fail (E_IS_MAIL_FOLDER_SORT_ORDER_DIALOG (dialog));
+
+       can = gtk_tree_selection_get_selected (selection, &model, &iter) &&
+             gtk_tree_model_iter_parent (model, &parent, &iter) &&
+             gtk_tree_model_iter_children (model, &iter, &parent);
+
+       if (can) {
+               can = FALSE;
+
+               do {
+                       guint sort_order = 0;
+
+                       gtk_tree_model_get (model, &iter,
+                               COL_UINT_SORT_ORDER, &sort_order,
+                               -1);
+
+                       can = sort_order > 0;
+               } while (!can && gtk_tree_model_iter_next (model, &iter));
+       }
+
+       gtk_action_set_sensitive (dialog->priv->reset_current_level_action, can);
+}
+
+static void
+sort_order_dialog_reset_current_level_activate_cb (GtkAction *action,
+                                                  gpointer user_data)
+{
+       EMailFolderSortOrderDialog *dialog = user_data;
+       EMailFolderTweaks *tweaks;
+       GtkTreeModel *model = NULL;
+       GtkTreeSelection *selection;
+       GtkTreeIter iter, parent;
+
+       g_return_if_fail (E_IS_MAIL_FOLDER_SORT_ORDER_DIALOG (dialog));
+
+       selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (dialog->priv->folder_tree));
+       if (!gtk_tree_selection_get_selected (selection, &model, &iter))
+               return;
+
+       if (!gtk_tree_model_iter_parent (model, &parent, &iter) ||
+           !gtk_tree_model_iter_children (model, &iter, &parent))
+               return;
+
+       tweaks = em_folder_tree_model_get_folder_tweaks (EM_FOLDER_TREE_MODEL (model));
+
+       /* Disable sorting */
+       gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (model),
+               GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID, GTK_SORT_ASCENDING);
+
+       do {
+               gchar *folder_uri = NULL;
+
+               gtk_tree_model_get (model, &iter,
+                       COL_STRING_FOLDER_URI, &folder_uri,
+                       -1);
+
+               if (folder_uri) {
+                       e_mail_folder_tweaks_set_sort_order (tweaks, folder_uri, 0);
+                       g_free (folder_uri);
+               }
+       } while (gtk_tree_model_iter_next (model, &iter));
+
+       /* Enable sorting */
+       gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (model),
+               GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID, GTK_SORT_ASCENDING);
+
+       sort_order_dialog_selection_changed_cb (selection, dialog);
+}
+
+static void
+sort_order_dialog_reset_all_levels_activate_cb (GtkAction *action,
+                                               gpointer user_data)
+{
+       EMailFolderSortOrderDialog *dialog = user_data;
+       EMailFolderTweaks *tweaks;
+       GtkTreeModel *model;
+       gchar *top_folder_uri;
+
+       g_return_if_fail (E_IS_MAIL_FOLDER_SORT_ORDER_DIALOG (dialog));
+
+       model = gtk_tree_view_get_model (GTK_TREE_VIEW (dialog->priv->folder_tree));
+       tweaks = em_folder_tree_model_get_folder_tweaks (EM_FOLDER_TREE_MODEL (model));
+
+       /* Disable sorting */
+       gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (model),
+               GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID, GTK_SORT_ASCENDING);
+
+       top_folder_uri = e_mail_folder_uri_build (dialog->priv->store, "");
+       e_mail_folder_tweaks_remove_sort_order_for_folders (tweaks, top_folder_uri);
+       g_free (top_folder_uri);
+
+       /* Enable sorting */
+       gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (model),
+               GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID, GTK_SORT_ASCENDING);
+
+       sort_order_dialog_selection_changed_cb (gtk_tree_view_get_selection (GTK_TREE_VIEW 
(dialog->priv->folder_tree)), dialog);
+}
+
+static void
+sort_order_tree_finish_drag (EMailFolderSortOrderDialog *dialog,
+                            gboolean is_drop)
+{
+       GtkTreeModel *model = NULL;
+       GtkTreePath *path = NULL;
+       GtkTreeIter iter;
+       gboolean has_level_top = FALSE;
+
+       if (dialog->priv->drag_row) {
+               GtkTreeIter parent;
+
+               model = gtk_tree_row_reference_get_model (dialog->priv->drag_row);
+               path = gtk_tree_row_reference_get_path (dialog->priv->drag_row);
+
+               has_level_top = gtk_tree_model_get_iter (model, &iter, path) &&
+                               gtk_tree_model_iter_parent (model, &parent, &iter) &&
+                               gtk_tree_model_iter_children (model, &iter, &parent);
+       }
+
+       if (is_drop && has_level_top && model) {
+               /* Save new order */
+               EMailFolderTweaks *tweaks = em_folder_tree_model_get_folder_tweaks (EM_FOLDER_TREE_MODEL 
(model));
+
+               do {
+                       gchar *folder_uri = NULL;
+                       guint sort_order = 0;
+
+                       gtk_tree_model_get (model, &iter,
+                               COL_STRING_FOLDER_URI, &folder_uri,
+                               COL_UINT_SORT_ORDER, &sort_order,
+                               -1);
+
+                       if (folder_uri) {
+                               e_mail_folder_tweaks_set_sort_order (tweaks, folder_uri, sort_order);
+
+                               g_free (folder_uri);
+                       }
+               } while (gtk_tree_model_iter_next (model, &iter));
+
+               sort_order_dialog_selection_changed_cb (gtk_tree_view_get_selection (GTK_TREE_VIEW 
(dialog->priv->folder_tree)), dialog);
+       } else if (has_level_top && model && dialog->priv->drag_state) {
+               /* Restore order to that before drag begun */
+               GtkTreeStore *tree_store = GTK_TREE_STORE (model);
+
+               do {
+                       gchar *folder_uri = NULL;
+
+                       gtk_tree_model_get (model, &iter,
+                               COL_STRING_FOLDER_URI, &folder_uri,
+                               -1);
+
+                       if (folder_uri) {
+                               guint sort_order;
+
+                               sort_order = GPOINTER_TO_UINT (g_hash_table_lookup (dialog->priv->drag_state, 
folder_uri));
+
+                               gtk_tree_store_set (tree_store, &iter,
+                                       COL_UINT_SORT_ORDER, sort_order,
+                                       -1);
+
+                               g_free (folder_uri);
+                       }
+               } while (gtk_tree_model_iter_next (model, &iter));
+       }
+
+       if (model) {
+               gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (model),
+                       GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID, GTK_SORT_ASCENDING);
+       }
+
+       gtk_tree_path_free (path);
+
+       if (dialog->priv->autoscroll_id) {
+               g_source_remove (dialog->priv->autoscroll_id);
+               dialog->priv->autoscroll_id = 0;
+       }
+
+       if (dialog->priv->drag_row) {
+               gtk_tree_row_reference_free (dialog->priv->drag_row);
+               dialog->priv->drag_row = NULL;
+       }
+
+       if (dialog->priv->drag_state) {
+               g_hash_table_destroy (dialog->priv->drag_state);
+               dialog->priv->drag_state = NULL;
+       }
+}
+
+#define SCROLL_EDGE_SIZE 15
+
+static gboolean
+sort_order_tree_autoscroll (gpointer user_data)
+{
+       EMailFolderSortOrderDialog *dialog = user_data;
+       GtkAdjustment *adjustment;
+       GtkTreeView *tree_view;
+       GtkScrollable *scrollable;
+       GdkRectangle rect;
+       GdkWindow *window;
+       GdkDisplay *display;
+       GdkDeviceManager *device_manager;
+       GdkDevice *device;
+       gdouble value;
+       gint offset, y;
+
+       /* Get the y pointer position relative to the treeview. */
+       tree_view = GTK_TREE_VIEW (dialog->priv->folder_tree);
+       window = gtk_tree_view_get_bin_window (tree_view);
+       display = gdk_window_get_display (window);
+       device_manager = gdk_display_get_device_manager (display);
+       device = gdk_device_manager_get_client_pointer (device_manager);
+       gdk_window_get_device_position (window, device, NULL, &y, NULL);
+
+       /* Rect is in coorinates relative to the scrolled window,
+        * relative to the treeview. */
+       gtk_tree_view_get_visible_rect (tree_view, &rect);
+
+       /* Move y into the same coordinate system as rect. */
+       y += rect.y;
+
+       /* See if we are near the top edge. */
+       offset = y - (rect.y + 2 * SCROLL_EDGE_SIZE);
+       if (offset > 0) {
+               /* See if we are near the bottom edge. */
+               offset = y - (rect.y + rect.height - 2 * SCROLL_EDGE_SIZE);
+               if (offset < 0)
+                       return TRUE;
+       }
+
+       scrollable = GTK_SCROLLABLE (tree_view);
+       adjustment = gtk_scrollable_get_vadjustment (scrollable);
+       value = gtk_adjustment_get_value (adjustment);
+       gtk_adjustment_set_value (adjustment, MAX (value + offset, 0.0));
+
+       return TRUE;
+}
+
+static void
+sort_order_tree_drag_begin_cb (GtkWidget *widget,
+                              GdkDragContext *context,
+                              gpointer user_data)
+{
+       EMailFolderSortOrderDialog *dialog = user_data;
+       GtkTreeSelection *selection;
+       cairo_surface_t *surface;
+       GtkTreeModel *model;
+       GtkTreePath *path;
+       GtkTreeView *tree_view;
+       GtkTreeIter iter;
+       gboolean is_folder = FALSE;
+
+       g_return_if_fail (dialog != NULL);
+
+       sort_order_tree_finish_drag (dialog, FALSE);
+
+       tree_view = GTK_TREE_VIEW (dialog->priv->folder_tree);
+
+       selection = gtk_tree_view_get_selection (tree_view);
+       if (!gtk_tree_selection_get_selected (selection, &model, &iter)) {
+               return;
+       }
+
+       gtk_tree_model_get (model, &iter, COL_BOOL_IS_FOLDER, &is_folder, -1);
+       if (!is_folder) {
+               return;
+       }
+
+       path = gtk_tree_model_get_path (model, &iter);
+
+       dialog->priv->drag_row = gtk_tree_row_reference_new (model, path);
+       dialog->priv->drag_changed = FALSE;
+
+       surface = gtk_tree_view_create_row_drag_icon (tree_view, path);
+       gtk_drag_set_icon_surface (context, surface);
+
+       gtk_tree_path_free (path);
+
+       if (dialog->priv->drag_row) {
+               GtkTreeIter parent;
+
+               if (gtk_tree_model_iter_parent (model, &parent, &iter) &&
+                   gtk_tree_model_iter_children (model, &iter, &parent)) {
+                       GtkTreeStore *tree_store = GTK_TREE_STORE (model);
+                       guint index = 1;
+
+                       dialog->priv->drag_state = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, 
NULL);
+
+                       do {
+                               guint sort_order = 0;
+                               gchar *folder_uri = NULL;
+
+                               gtk_tree_model_get (model, &iter,
+                                       COL_STRING_FOLDER_URI, &folder_uri,
+                                       COL_UINT_SORT_ORDER, &sort_order,
+                                       -1);
+
+                               if (folder_uri) {
+                                       g_hash_table_insert (dialog->priv->drag_state, folder_uri, 
GUINT_TO_POINTER (sort_order));
+
+                                       gtk_tree_store_set (tree_store, &iter,
+                                               COL_UINT_SORT_ORDER, index,
+                                               -1);
+                               }
+
+                               index++;
+                       } while (gtk_tree_model_iter_next (model, &iter));
+               }
+
+               gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (model),
+                       GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID, GTK_SORT_ASCENDING);
+       }
+}
+
+static gboolean
+sort_order_tree_drag_motion_cb (GtkWidget *widget,
+                               GdkDragContext *context,
+                               gint x,
+                               gint y,
+                               guint time,
+                               gpointer user_data)
+{
+       EMailFolderSortOrderDialog *dialog = user_data;
+       GtkTreeView *tree_view;
+       GtkTreeModel *model;
+       GtkTreeIter iter;
+       GtkTreePath *path = NULL, *drag_path;
+       gboolean can, different_paths;
+
+       g_return_val_if_fail (dialog != NULL, FALSE);
+
+       tree_view = GTK_TREE_VIEW (dialog->priv->folder_tree);
+
+       if (!dialog->priv->drag_row ||
+           !gtk_tree_view_get_dest_row_at_pos (tree_view, x, y, &path, NULL)) {
+               gdk_drag_status (context, 0, time);
+               return FALSE;
+       }
+
+       if (!dialog->priv->autoscroll_id) {
+               dialog->priv->autoscroll_id = e_named_timeout_add (
+                       150, sort_order_tree_autoscroll, dialog);
+       }
+
+       model = gtk_tree_view_get_model (tree_view);
+
+       g_warn_if_fail (gtk_tree_model_get_iter (model, &iter, path));
+
+       drag_path = gtk_tree_row_reference_get_path (dialog->priv->drag_row);
+
+       different_paths = drag_path && gtk_tree_path_compare (drag_path, path) != 0;
+
+       /* The paths are not the same or the order was already changed, but they have the same parent */
+       can = drag_path && (dialog->priv->drag_changed || different_paths) &&
+             gtk_tree_path_get_depth (drag_path) > 1 &&
+             gtk_tree_path_get_depth (path) > 1 &&
+             gtk_tree_path_up (drag_path) &&
+             gtk_tree_path_up (path) &&
+             gtk_tree_path_compare (drag_path, path) == 0;
+
+       gtk_tree_path_free (drag_path);
+       gtk_tree_path_free (path);
+
+       if (can && different_paths) {
+               GtkTreeStore *tree_store = GTK_TREE_STORE (model);
+               GtkTreeIter drag_iter;
+               guint drop_sort_order = 0, drag_sort_order = 0;
+
+               drag_path = gtk_tree_row_reference_get_path (dialog->priv->drag_row);
+               g_warn_if_fail (gtk_tree_model_get_iter (model, &drag_iter, drag_path));
+
+               gtk_tree_path_free (drag_path);
+
+               gtk_tree_model_get (model, &drag_iter,
+                       COL_UINT_SORT_ORDER, &drag_sort_order,
+                       -1);
+
+               gtk_tree_model_get (model, &iter,
+                       COL_UINT_SORT_ORDER, &drop_sort_order,
+                       -1);
+
+               if (drag_sort_order < drop_sort_order) {
+                       do {
+                               guint curr_sort_order = 0;
+
+                               gtk_tree_model_get (model, &drag_iter,
+                                       COL_UINT_SORT_ORDER, &curr_sort_order,
+                                       -1);
+
+                               if (curr_sort_order == drag_sort_order) {
+                                       gtk_tree_store_set (tree_store, &drag_iter,
+                                               COL_UINT_SORT_ORDER, drop_sort_order,
+                                               -1);
+                               } else {
+                                       g_warn_if_fail (curr_sort_order > 1);
+
+                                       gtk_tree_store_set (tree_store, &drag_iter,
+                                               COL_UINT_SORT_ORDER, curr_sort_order - 1,
+                                               -1);
+
+                                       if (curr_sort_order == drop_sort_order)
+                                               break;
+                               }
+                       } while (gtk_tree_model_iter_next (model, &drag_iter));
+               } else {
+                       do {
+                               guint curr_sort_order = 0;
+
+                               gtk_tree_model_get (model, &drag_iter,
+                                       COL_UINT_SORT_ORDER, &curr_sort_order,
+                                       -1);
+
+                               if (curr_sort_order == drag_sort_order) {
+                                       gtk_tree_store_set (tree_store, &drag_iter,
+                                               COL_UINT_SORT_ORDER, drop_sort_order,
+                                               -1);
+                               } else {
+                                       gtk_tree_store_set (tree_store, &drag_iter,
+                                               COL_UINT_SORT_ORDER, curr_sort_order + 1,
+                                               -1);
+
+                                       if (curr_sort_order == drop_sort_order)
+                                               break;
+                               }
+                       } while (gtk_tree_model_iter_previous (model, &drag_iter));
+               }
+
+               /* Re-sort after change by enable and immediately disable the sorting */
+               gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (model),
+                       GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID, GTK_SORT_ASCENDING);
+
+               gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (model),
+                       GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID, GTK_SORT_ASCENDING);
+
+               dialog->priv->drag_changed = TRUE;
+       }
+
+       gdk_drag_status (context, (can || dialog->priv->drag_changed) ? GDK_ACTION_MOVE : 0, time);
+
+       return TRUE;
+}
+
+static void
+sort_order_tree_drag_leave_cb (GtkWidget *widget,
+                              GdkDragContext *context,
+                              guint time,
+                              gpointer user_data)
+{
+       EMailFolderSortOrderDialog *dialog = user_data;
+       GtkTreeView *tree_view;
+
+       tree_view = GTK_TREE_VIEW (dialog->priv->folder_tree);
+
+       if (dialog->priv->autoscroll_id) {
+               g_source_remove (dialog->priv->autoscroll_id);
+               dialog->priv->autoscroll_id = 0;
+       }
+
+       gtk_tree_view_set_drag_dest_row (tree_view, NULL, GTK_TREE_VIEW_DROP_BEFORE);
+}
+
+static gboolean
+sort_order_tree_drag_drop_cb (GtkWidget *widget,
+                             GdkDragContext *context,
+                             gint x,
+                             gint y,
+                             guint time,
+                             gpointer user_data)
+{
+       EMailFolderSortOrderDialog *dialog = user_data;
+
+       g_return_val_if_fail (dialog != NULL, FALSE);
+
+       sort_order_tree_finish_drag (dialog, TRUE);
+
+       return TRUE;
+}
+
+static void
+sort_order_tree_drag_end_cb (GtkWidget *widget,
+                            GdkDragContext *context,
+                            gpointer user_data)
+{
+       EMailFolderSortOrderDialog *dialog = user_data;
+
+       g_return_if_fail (dialog != NULL);
+
+       sort_order_tree_finish_drag (dialog, FALSE);
+}
+
+static void
+e_mail_folder_sort_order_dialog_realize (GtkWidget *widget)
+{
+       EMailFolderSortOrderDialog *dialog;
+       GtkTreePath *path;
+
+       /* Chain up to parent's method. */
+       GTK_WIDGET_CLASS (e_mail_folder_sort_order_dialog_parent_class)->realize (widget);
+
+       g_return_if_fail (E_IS_MAIL_FOLDER_SORT_ORDER_DIALOG (widget));
+
+       dialog = E_MAIL_FOLDER_SORT_ORDER_DIALOG (widget);
+
+       path = gtk_tree_path_new_first ();
+       gtk_tree_view_expand_to_path (GTK_TREE_VIEW (dialog->priv->folder_tree), path);
+       gtk_tree_path_free (path);
+
+       if (dialog->priv->folder_uri)
+               em_folder_tree_set_selected (EM_FOLDER_TREE (dialog->priv->folder_tree), 
dialog->priv->folder_uri, FALSE);
+}
+
+static void
+e_mail_folder_sort_order_dialog_submit_alert (EAlertSink *alert_sink,
+                                             EAlert *alert)
+{
+       /* This should not be called */
+       g_warn_if_reached ();
+}
+
+static void
+e_mail_folder_sort_order_dialog_set_folder_uri (EMailFolderSortOrderDialog *dialog,
+                                               const gchar *folder_uri)
+{
+       g_return_if_fail (E_IS_MAIL_FOLDER_SORT_ORDER_DIALOG (dialog));
+
+       if (g_strcmp0 (dialog->priv->folder_uri, folder_uri) != 0) {
+               g_free (dialog->priv->folder_uri);
+               dialog->priv->folder_uri = g_strdup (folder_uri);
+
+               g_object_notify (G_OBJECT (dialog), "folder-uri");
+       }
+}
+
+static const gchar *
+e_mail_folder_sort_order_dialog_get_folder_uri (EMailFolderSortOrderDialog *dialog)
+{
+       g_return_val_if_fail (E_IS_MAIL_FOLDER_SORT_ORDER_DIALOG (dialog), NULL);
+
+       return dialog->priv->folder_uri;
+}
+
+static void
+e_mail_folder_sort_order_dialog_set_store (EMailFolderSortOrderDialog *dialog,
+                                          CamelStore *store)
+{
+       g_return_if_fail (E_IS_MAIL_FOLDER_SORT_ORDER_DIALOG (dialog));
+       g_return_if_fail (CAMEL_IS_STORE (store));
+
+       if (dialog->priv->store != store) {
+               g_clear_object (&dialog->priv->store);
+               dialog->priv->store = g_object_ref (store);
+
+               g_object_notify (G_OBJECT (dialog), "store");
+       }
+}
+
+static CamelStore *
+e_mail_folder_sort_order_dialog_get_store (EMailFolderSortOrderDialog *dialog)
+{
+       g_return_val_if_fail (E_IS_MAIL_FOLDER_SORT_ORDER_DIALOG (dialog), NULL);
+
+       return dialog->priv->store;
+}
+
+static void
+e_mail_folder_sort_order_dialog_set_property (GObject *object,
+                                             guint property_id,
+                                             const GValue *value,
+                                             GParamSpec *pspec)
+{
+       switch (property_id) {
+               case PROP_FOLDER_URI:
+                       e_mail_folder_sort_order_dialog_set_folder_uri (
+                               E_MAIL_FOLDER_SORT_ORDER_DIALOG (object),
+                               g_value_get_string (value));
+                       return;
+
+               case PROP_STORE:
+                       e_mail_folder_sort_order_dialog_set_store (
+                               E_MAIL_FOLDER_SORT_ORDER_DIALOG (object),
+                               g_value_get_object (value));
+                       return;
+       }
+
+       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+}
+
+static void
+e_mail_folder_sort_order_dialog_get_property (GObject *object,
+                                             guint property_id,
+                                             GValue *value,
+                                             GParamSpec *pspec)
+{
+       switch (property_id) {
+               case PROP_FOLDER_URI:
+                       g_value_set_string (
+                               value,
+                               e_mail_folder_sort_order_dialog_get_folder_uri (
+                               E_MAIL_FOLDER_SORT_ORDER_DIALOG (object)));
+                       return;
+
+               case PROP_STORE:
+                       g_value_set_object (
+                               value,
+                               e_mail_folder_sort_order_dialog_get_store (
+                               E_MAIL_FOLDER_SORT_ORDER_DIALOG (object)));
+                       return;
+       }
+
+       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+}
+
+static void
+e_mail_folder_sort_order_dialog_constructed (GObject *object)
+{
+       const GtkTargetEntry row_targets[] = {
+               { (gchar *) "EMailFolderSortOrderDialog", GTK_TARGET_SAME_WIDGET, 0 }
+       };
+       EMailFolderSortOrderDialog *dialog = E_MAIL_FOLDER_SORT_ORDER_DIALOG (object);
+       GtkWidget *folder_tree, *vbox, *widget;
+       EMFolderTreeModel *model;
+       ETreeViewFrame *tree_view_frame;
+       GtkTreeSelection *selection;
+       CamelSession *session;
+       GtkAction *action;
+
+       /* Chain up to parent's method. */
+       G_OBJECT_CLASS (e_mail_folder_sort_order_dialog_parent_class)->constructed (object);
+
+       g_return_if_fail (CAMEL_IS_STORE (dialog->priv->store));
+
+       session = camel_service_ref_session (CAMEL_SERVICE (dialog->priv->store));
+       g_return_if_fail (E_IS_MAIL_SESSION (session));
+
+       gtk_window_set_default_size (GTK_WINDOW (dialog), 400, 500);
+       gtk_window_set_title (GTK_WINDOW (dialog), _("Folder Sort Order"));
+       gtk_container_set_border_width (GTK_CONTAINER (dialog), 5);
+
+       widget = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
+       gtk_container_set_border_width (GTK_CONTAINER (widget), 5);
+       gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))), widget, TRUE, TRUE, 
0);
+       gtk_widget_show (widget);
+
+       vbox = widget;
+
+       model = em_folder_tree_model_new ();
+       em_folder_tree_model_set_session (model, E_MAIL_SESSION (session));
+       em_folder_tree_model_add_store (model, dialog->priv->store);
+
+       folder_tree = em_folder_tree_new_with_model (E_MAIL_SESSION (session), E_ALERT_SINK (dialog), model);
+       gtk_widget_show (folder_tree);
+
+       dialog->priv->folder_tree = folder_tree;
+
+       selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (folder_tree));
+
+       g_signal_connect (selection, "changed",
+               G_CALLBACK (sort_order_dialog_selection_changed_cb), dialog);
+
+       widget = e_tree_view_frame_new ();
+       gtk_box_pack_start (GTK_BOX (vbox), widget, TRUE, TRUE, 0);
+       gtk_widget_set_size_request (widget, -1, 240);
+       gtk_widget_show (widget);
+
+       tree_view_frame = E_TREE_VIEW_FRAME (widget);
+       e_tree_view_frame_set_tree_view (tree_view_frame, GTK_TREE_VIEW (folder_tree));
+       e_tree_view_frame_set_toolbar_visible (tree_view_frame, TRUE);
+       gtk_widget_grab_focus (folder_tree);
+
+       action = e_tree_view_frame_lookup_toolbar_action (tree_view_frame, E_TREE_VIEW_FRAME_ACTION_ADD);
+       gtk_action_set_visible (action, FALSE);
+
+       action = e_tree_view_frame_lookup_toolbar_action (tree_view_frame, E_TREE_VIEW_FRAME_ACTION_REMOVE);
+       gtk_action_set_visible (action, FALSE);
+
+       action = gtk_action_new ("FolderSortOrder-reset-current",
+               _("Reset c_urrent level"),
+               _("Reset sort order in the current level to the defaults"),
+               NULL);
+       dialog->priv->reset_current_level_action = action;
+
+       g_signal_connect (action, "activate",
+               G_CALLBACK (sort_order_dialog_reset_current_level_activate_cb), dialog);
+
+       e_tree_view_frame_insert_toolbar_action (tree_view_frame, action, 0);
+
+       action = gtk_action_new ("FolderSortOrder-reset-all",
+               _("Reset _all levels"),
+               _("Reset sort order in all levels to their defaults"),
+               NULL);
+
+       g_signal_connect (action, "activate",
+               G_CALLBACK (sort_order_dialog_reset_all_levels_activate_cb), dialog);
+
+       e_tree_view_frame_insert_toolbar_action (tree_view_frame, action, 1);
+
+       g_clear_object (&session);
+       g_clear_object (&model);
+
+       gtk_dialog_add_buttons (GTK_DIALOG (dialog), _("_Close"), GTK_RESPONSE_CANCEL, NULL);
+
+       gtk_drag_source_set (dialog->priv->folder_tree, GDK_BUTTON1_MASK, row_targets, G_N_ELEMENTS 
(row_targets), GDK_ACTION_MOVE);
+       gtk_drag_dest_set (dialog->priv->folder_tree, GTK_DEST_DEFAULT_MOTION, row_targets, G_N_ELEMENTS 
(row_targets), GDK_ACTION_MOVE);
+
+       g_signal_connect (dialog->priv->folder_tree, "drag-begin",
+               G_CALLBACK (sort_order_tree_drag_begin_cb), dialog);
+       g_signal_connect (dialog->priv->folder_tree, "drag-motion",
+               G_CALLBACK (sort_order_tree_drag_motion_cb), dialog);
+       g_signal_connect (dialog->priv->folder_tree, "drag-leave",
+               G_CALLBACK (sort_order_tree_drag_leave_cb), dialog);
+       g_signal_connect (dialog->priv->folder_tree, "drag-drop",
+               G_CALLBACK (sort_order_tree_drag_drop_cb), dialog);
+       g_signal_connect (dialog->priv->folder_tree, "drag-end",
+               G_CALLBACK (sort_order_tree_drag_end_cb), dialog);
+}
+
+static void
+e_mail_folder_sort_order_dialog_dispose (GObject *object)
+{
+       EMailFolderSortOrderDialog *dialog = E_MAIL_FOLDER_SORT_ORDER_DIALOG (object);
+
+       if (dialog->priv->autoscroll_id) {
+               g_source_remove (dialog->priv->autoscroll_id);
+               dialog->priv->autoscroll_id = 0;
+       }
+
+       if (dialog->priv->drag_row) {
+               gtk_tree_row_reference_free (dialog->priv->drag_row);
+               dialog->priv->drag_row = NULL;
+       }
+
+       /* Chain up to parent's method. */
+       G_OBJECT_CLASS (e_mail_folder_sort_order_dialog_parent_class)->dispose (object);
+}
+
+static void
+e_mail_folder_sort_order_dialog_finalize (GObject *object)
+{
+       EMailFolderSortOrderDialog *dialog = E_MAIL_FOLDER_SORT_ORDER_DIALOG (object);
+
+       g_clear_object (&dialog->priv->store);
+       g_clear_pointer (&dialog->priv->folder_uri, g_free);
+
+       /* Chain up to parent's method. */
+       G_OBJECT_CLASS (e_mail_folder_sort_order_dialog_parent_class)->finalize (object);
+}
+
+static void
+e_mail_folder_sort_order_dialog_class_init (EMailFolderSortOrderDialogClass *klass)
+{
+       GObjectClass *object_class;
+       GtkWidgetClass *widget_class;
+
+       g_type_class_add_private (klass, sizeof (EMailFolderSortOrderDialogPrivate));
+
+       widget_class = GTK_WIDGET_CLASS (klass);
+       widget_class->realize = e_mail_folder_sort_order_dialog_realize;
+
+       object_class = G_OBJECT_CLASS (klass);
+       object_class->set_property = e_mail_folder_sort_order_dialog_set_property;
+       object_class->get_property = e_mail_folder_sort_order_dialog_get_property;
+       object_class->constructed = e_mail_folder_sort_order_dialog_constructed;
+       object_class->dispose = e_mail_folder_sort_order_dialog_dispose;
+       object_class->finalize = e_mail_folder_sort_order_dialog_finalize;
+
+       g_object_class_install_property (
+               object_class,
+               PROP_STORE,
+               g_param_spec_object (
+                       "store",
+                       NULL,
+                       NULL,
+                       CAMEL_TYPE_STORE,
+                       G_PARAM_READWRITE |
+                       G_PARAM_CONSTRUCT_ONLY |
+                       G_PARAM_STATIC_STRINGS));
+
+       g_object_class_install_property (
+               object_class,
+               PROP_FOLDER_URI,
+               g_param_spec_string (
+                       "folder-uri",
+                       NULL,
+                       NULL,
+                       NULL,
+                       G_PARAM_READWRITE |
+                       G_PARAM_CONSTRUCT_ONLY |
+                       G_PARAM_STATIC_STRINGS));
+}
+
+static void
+e_mail_folder_sort_order_dialog_alert_sink_init (EAlertSinkInterface *interface)
+{
+       interface->submit_alert = e_mail_folder_sort_order_dialog_submit_alert;
+}
+
+static void
+e_mail_folder_sort_order_dialog_init (EMailFolderSortOrderDialog *dialog)
+{
+       dialog->priv = G_TYPE_INSTANCE_GET_PRIVATE (dialog, E_TYPE_MAIL_FOLDER_SORT_ORDER_DIALOG, 
EMailFolderSortOrderDialogPrivate);
+}
+
+GtkWidget *
+e_mail_folder_sort_order_dialog_new (GtkWindow *parent,
+                                    CamelStore *store,
+                                    const gchar *folder_uri)
+{
+       g_return_val_if_fail (CAMEL_IS_STORE (store), NULL);
+
+       return g_object_new (E_TYPE_MAIL_FOLDER_SORT_ORDER_DIALOG,
+               "transient-for", parent,
+               "store", store,
+               "folder-uri", folder_uri,
+               NULL);
+}
diff --git a/src/mail/e-mail-folder-sort-order-dialog.h b/src/mail/e-mail-folder-sort-order-dialog.h
new file mode 100644
index 0000000000..34fb771530
--- /dev/null
+++ b/src/mail/e-mail-folder-sort-order-dialog.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2019 Red Hat, Inc. (www.redhat.com)
+ *
+ * This library is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef E_MAIL_FOLDER_SORT_ORDER_DIALOG_H
+#define E_MAIL_FOLDER_SORT_ORDER_DIALOG_H
+
+#include <gtk/gtk.h>
+
+#include <mail/em-folder-tree.h>
+#include <mail/em-folder-tree-model.h>
+
+/* Standard GObject macros */
+#define E_TYPE_MAIL_FOLDER_SORT_ORDER_DIALOG \
+       (e_mail_folder_sort_order_dialog_get_type ())
+#define E_MAIL_FOLDER_SORT_ORDER_DIALOG(obj) \
+       (G_TYPE_CHECK_INSTANCE_CAST \
+       ((obj), E_TYPE_MAIL_FOLDER_SORT_ORDER_DIALOG, EMailFolderSortOrderDialog))
+#define E_MAIL_FOLDER_SORT_ORDER_DIALOG_CLASS(cls) \
+       (G_TYPE_CHECK_CLASS_CAST \
+       ((cls), E_TYPE_MAIL_FOLDER_SORT_ORDER_DIALOG, EMailFolderSortOrderDialogClass))
+#define E_IS_MAIL_FOLDER_SORT_ORDER_DIALOG(obj) \
+       (G_TYPE_CHECK_INSTANCE_TYPE \
+       ((obj), E_TYPE_MAIL_FOLDER_SORT_ORDER_DIALOG))
+#define E_IS_MAIL_FOLDER_SORT_ORDER_DIALOG_CLASS(cls) \
+       (G_TYPE_CHECK_CLASS_TYPE \
+       ((cls), E_TYPE_MAIL_FOLDER_SORT_ORDER_DIALOG))
+#define E_MAIL_FOLDER_SORT_ORDER_DIALOG_GET_CLASS(obj) \
+       (G_TYPE_INSTANCE_GET_CLASS \
+       ((obj), E_TYPE_MAIL_FOLDER_SORT_ORDER_DIALOG, EMailFolderSortOrderDialogClass))
+
+G_BEGIN_DECLS
+
+typedef struct _EMailFolderSortOrderDialog EMailFolderSortOrderDialog;
+typedef struct _EMailFolderSortOrderDialogClass EMailFolderSortOrderDialogClass;
+typedef struct _EMailFolderSortOrderDialogPrivate EMailFolderSortOrderDialogPrivate;
+
+struct _EMailFolderSortOrderDialog {
+       /*< private >*/
+       GtkDialog parent;
+       EMailFolderSortOrderDialogPrivate *priv;
+};
+
+struct _EMailFolderSortOrderDialogClass {
+       /*< private >*/
+       GtkDialogClass parent_class;
+};
+
+GType          e_mail_folder_sort_order_dialog_get_type        (void);
+
+GtkWidget *    e_mail_folder_sort_order_dialog_new             (GtkWindow *parent,
+                                                                CamelStore *store,
+                                                                const gchar *folder_uri);
+
+G_END_DECLS
+
+#endif /* E_MAIL_FOLDER_SORT_ORDER_DIALOG_H */
diff --git a/src/mail/e-mail-folder-tweaks.c b/src/mail/e-mail-folder-tweaks.c
index 2b4f754106..b9a63791fd 100644
--- a/src/mail/e-mail-folder-tweaks.c
+++ b/src/mail/e-mail-folder-tweaks.c
@@ -26,6 +26,7 @@
 
 #define KEY_TEXT_COLOR         "Color"
 #define KEY_ICON_FILENAME      "Icon"
+#define KEY_SORT_ORDER         "Sort"
 
 struct _EMailFolderTweaksPrivate {
        gchar *config_filename;
@@ -73,6 +74,31 @@ mail_folder_tweaks_schedule_save (EMailFolderTweaks *tweaks)
        }
 }
 
+static gboolean
+mail_folder_tweaks_remove_key (EMailFolderTweaks *tweaks,
+                              const gchar *folder_uri,
+                              const gchar *key)
+{
+       gboolean changed;
+
+       changed = g_key_file_remove_key (tweaks->priv->config, folder_uri, key, NULL);
+
+       if (changed) {
+               gchar **keys;
+
+               keys = g_key_file_get_keys (tweaks->priv->config, folder_uri, NULL, NULL);
+
+               /* Remove the whole group, if it's the last key in it */
+               if (!keys || !keys[0]) {
+                       g_key_file_remove_group (tweaks->priv->config, folder_uri, NULL);
+               }
+
+               g_strfreev (keys);
+       }
+
+       return changed;
+}
+
 static gchar *
 mail_folder_tweaks_dup_string (EMailFolderTweaks *tweaks,
                               const gchar *folder_uri,
@@ -98,19 +124,7 @@ mail_folder_tweaks_set_string (EMailFolderTweaks *tweaks,
        g_return_if_fail (key != NULL);
 
        if (!value || !*value) {
-               changed = g_key_file_remove_key (tweaks->priv->config, folder_uri, key, NULL);
-               if (changed) {
-                       gchar **keys;
-
-                       keys = g_key_file_get_keys (tweaks->priv->config, folder_uri, NULL, NULL);
-
-                       /* Remove the whole group, if it's the last key in it */
-                       if (!keys || !keys[0]) {
-                               g_key_file_remove_group (tweaks->priv->config, folder_uri, NULL);
-                       }
-
-                       g_strfreev (keys);
-               }
+               changed = mail_folder_tweaks_remove_key (tweaks, folder_uri, key);
        } else {
                gchar *stored;
 
@@ -129,6 +143,49 @@ mail_folder_tweaks_set_string (EMailFolderTweaks *tweaks,
        }
 }
 
+static guint
+mail_folder_tweaks_get_uint (EMailFolderTweaks *tweaks,
+                            const gchar *folder_uri,
+                            const gchar *key)
+{
+       g_return_val_if_fail (E_IS_MAIL_FOLDER_TWEAKS (tweaks), 0);
+       g_return_val_if_fail (folder_uri != NULL, 0);
+       g_return_val_if_fail (key != NULL, 0);
+
+       return (guint) g_key_file_get_uint64 (tweaks->priv->config, folder_uri, key, NULL);
+}
+
+static void
+mail_folder_tweaks_set_uint (EMailFolderTweaks *tweaks,
+                            const gchar *folder_uri,
+                            const gchar *key,
+                            guint value)
+{
+       gboolean changed;
+
+       g_return_if_fail (E_IS_MAIL_FOLDER_TWEAKS (tweaks));
+       g_return_if_fail (folder_uri != NULL);
+       g_return_if_fail (key != NULL);
+
+       if (!value) {
+               changed = mail_folder_tweaks_remove_key (tweaks, folder_uri, key);
+       } else {
+               guint stored;
+
+               stored = mail_folder_tweaks_get_uint (tweaks, folder_uri, key);
+               changed = stored != value;
+
+               if (changed)
+                       g_key_file_set_uint64 (tweaks->priv->config, folder_uri, key, (guint64) value);
+       }
+
+       if (changed) {
+               mail_folder_tweaks_schedule_save (tweaks);
+
+               g_signal_emit (tweaks, signals[CHANGED], 0, folder_uri, NULL);
+       }
+}
+
 static GObject *
 e_mail_folder_tweaks_constructor (GType type,
                                  guint n_construct_properties,
@@ -217,7 +274,7 @@ e_mail_folder_tweaks_remove_for_folders (EMailFolderTweaks *tweaks,
 
        for (ii = 0; groups[ii]; ii++) {
                if (g_str_has_prefix (groups[ii], top_folder_uri)) {
-                       changed = g_key_file_remove_group (tweaks->priv->config, groups[ii], NULL);
+                       changed = g_key_file_remove_group (tweaks->priv->config, groups[ii], NULL) || changed;
                }
        }
 
@@ -274,8 +331,8 @@ gchar *
 e_mail_folder_tweaks_dup_icon_filename (EMailFolderTweaks *tweaks,
                                        const gchar *folder_uri)
 {
-       g_return_val_if_fail (E_IS_MAIL_FOLDER_TWEAKS (tweaks), FALSE);
-       g_return_val_if_fail (folder_uri != NULL, FALSE);
+       g_return_val_if_fail (E_IS_MAIL_FOLDER_TWEAKS (tweaks), NULL);
+       g_return_val_if_fail (folder_uri != NULL, NULL);
 
        return mail_folder_tweaks_dup_string (tweaks, folder_uri, KEY_ICON_FILENAME);
 }
@@ -290,3 +347,51 @@ e_mail_folder_tweaks_set_icon_filename (EMailFolderTweaks *tweaks,
 
        mail_folder_tweaks_set_string (tweaks, folder_uri, KEY_ICON_FILENAME, icon_filename);
 }
+
+/* returns 0 as not set/do not know */
+guint
+e_mail_folder_tweaks_get_sort_order (EMailFolderTweaks *tweaks,
+                                       const gchar *folder_uri)
+{
+       g_return_val_if_fail (E_IS_MAIL_FOLDER_TWEAKS (tweaks), 0);
+       g_return_val_if_fail (folder_uri != NULL, 0);
+
+       return mail_folder_tweaks_get_uint (tweaks, folder_uri, KEY_SORT_ORDER);
+}
+
+/* Use 0 as 'sort_order' to unset the value */
+void
+e_mail_folder_tweaks_set_sort_order (EMailFolderTweaks *tweaks,
+                                    const gchar *folder_uri,
+                                    guint sort_order)
+{
+       g_return_if_fail (E_IS_MAIL_FOLDER_TWEAKS (tweaks));
+       g_return_if_fail (folder_uri != NULL);
+
+       mail_folder_tweaks_set_uint (tweaks, folder_uri, KEY_SORT_ORDER, sort_order);
+}
+
+void
+e_mail_folder_tweaks_remove_sort_order_for_folders (EMailFolderTweaks *tweaks,
+                                                   const gchar *top_folder_uri)
+{
+       gchar **groups;
+       gint ii;
+
+       g_return_if_fail (E_IS_MAIL_FOLDER_TWEAKS (tweaks));
+       g_return_if_fail (top_folder_uri != NULL);
+
+       groups = g_key_file_get_groups (tweaks->priv->config, NULL);
+
+       if (!groups)
+               return;
+
+       for (ii = 0; groups[ii]; ii++) {
+               if (g_str_has_prefix (groups[ii], top_folder_uri) &&
+                   g_key_file_has_key (tweaks->priv->config, groups[ii], KEY_SORT_ORDER, NULL)) {
+                       e_mail_folder_tweaks_set_sort_order (tweaks, groups[ii], 0);
+               }
+       }
+
+       g_strfreev (groups);
+}
diff --git a/src/mail/e-mail-folder-tweaks.h b/src/mail/e-mail-folder-tweaks.h
index 23fc379cbf..2d1b46a16f 100644
--- a/src/mail/e-mail-folder-tweaks.h
+++ b/src/mail/e-mail-folder-tweaks.h
@@ -80,6 +80,16 @@ void         e_mail_folder_tweaks_set_icon_filename
                                                (EMailFolderTweaks *tweaks,
                                                 const gchar *folder_uri,
                                                 const gchar *icon_filename);
+guint          e_mail_folder_tweaks_get_sort_order
+                                               (EMailFolderTweaks *tweaks,
+                                                const gchar *folder_uri);
+void           e_mail_folder_tweaks_set_sort_order
+                                               (EMailFolderTweaks *tweaks,
+                                                const gchar *folder_uri,
+                                                guint sort_order);
+void           e_mail_folder_tweaks_remove_sort_order_for_folders
+                                               (EMailFolderTweaks *tweaks,
+                                                const gchar *top_folder_uri);
 
 G_END_DECLS
 
diff --git a/src/mail/em-folder-tree-model.c b/src/mail/em-folder-tree-model.c
index cc56965ed9..8269745644 100644
--- a/src/mail/em-folder-tree-model.c
+++ b/src/mail/em-folder-tree-model.c
@@ -414,6 +414,7 @@ folder_tree_model_sort (GtkTreeModel *model,
        gboolean b_is_store;
        const gchar *store_uid = NULL;
        guint32 flags_a, flags_b;
+       guint sort_order_a = 0, sort_order_b = 0;
        gint rv = -2;
 
        folder_tree_model = EM_FOLDER_TREE_MODEL (model);
@@ -424,6 +425,7 @@ folder_tree_model_sort (GtkTreeModel *model,
                COL_OBJECT_CAMEL_STORE, &service_a,
                COL_STRING_DISPLAY_NAME, &aname,
                COL_UINT_FLAGS, &flags_a,
+               COL_UINT_SORT_ORDER, &sort_order_a,
                -1);
 
        gtk_tree_model_get (
@@ -432,12 +434,20 @@ folder_tree_model_sort (GtkTreeModel *model,
                COL_OBJECT_CAMEL_STORE, &service_b,
                COL_STRING_DISPLAY_NAME, &bname,
                COL_UINT_FLAGS, &flags_b,
+               COL_UINT_SORT_ORDER, &sort_order_b,
                -1);
 
        if (CAMEL_IS_SERVICE (service_a))
                store_uid = camel_service_get_uid (service_a);
 
-       if (a_is_store && b_is_store) {
+       if (!a_is_store && !b_is_store && (sort_order_a || sort_order_b)) {
+               if (sort_order_a && sort_order_b)
+                       rv = sort_order_a < sort_order_b ? -1 : (sort_order_a > sort_order_b ? 1 : 0);
+               else if (sort_order_a)
+                       rv = -1;
+               else
+                       rv = 1;
+       } else if (a_is_store && b_is_store) {
                rv = e_mail_account_store_compare_services (
                        folder_tree_model->priv->account_store,
                        service_a, service_b);
@@ -769,7 +779,8 @@ folder_tree_model_constructed (GObject *object)
                G_TYPE_BOOLEAN,   /* status spinner visible */
                G_TYPE_STRING,    /* COL_STRING_FOLDER_URI */
                G_TYPE_ICON,      /* COL_GICON_CUSTOM_ICON */
-               GDK_TYPE_RGBA     /* COL_RGBA_FOREGROUND_RGBA */
+               GDK_TYPE_RGBA,    /* COL_RGBA_FOREGROUND_RGBA */
+               G_TYPE_UINT       /* COL_UINT_SORT_ORDER */
        };
 
        g_warn_if_fail (G_N_ELEMENTS (col_types) == NUM_COLUMNS);
@@ -2030,6 +2041,7 @@ em_folder_tree_model_update_row_tweaks (EMFolderTreeModel *model,
        GIcon *custom_icon = NULL;
        GdkRGBA *foreground = NULL, rgba;
        gchar *folder_uri = NULL, *icon_filename;
+       guint sort_order;
 
        g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));
        g_return_if_fail (iter != NULL);
@@ -2055,9 +2067,12 @@ em_folder_tree_model_update_row_tweaks (EMFolderTreeModel *model,
                g_clear_object (&file);
        }
 
+       sort_order = e_mail_folder_tweaks_get_sort_order (model->priv->folder_tweaks, folder_uri);
+
        gtk_tree_store_set (GTK_TREE_STORE (model), iter,
                COL_GICON_CUSTOM_ICON, custom_icon,
                COL_RGBA_FOREGROUND_RGBA, foreground,
+               COL_UINT_SORT_ORDER, sort_order,
                -1);
 
        g_clear_object (&custom_icon);
diff --git a/src/mail/em-folder-tree-model.h b/src/mail/em-folder-tree-model.h
index 0d9c5b99cf..33c1da8a02 100644
--- a/src/mail/em-folder-tree-model.h
+++ b/src/mail/em-folder-tree-model.h
@@ -80,6 +80,7 @@ enum {
        COL_STRING_FOLDER_URI,          /* folder URI */
        COL_GICON_CUSTOM_ICON,          /* a custom icon to use for the folder; NULL to use 
COL_STRING_ICON_NAME */
        COL_RGBA_FOREGROUND_RGBA,       /* GdkRGBA for the foreground color; can be NULL */
+       COL_UINT_SORT_ORDER,            /* 0 - use default; non-zero - define sort order on its level */
 
        NUM_COLUMNS
 };
diff --git a/src/modules/mail/e-mail-shell-view-actions.c b/src/modules/mail/e-mail-shell-view-actions.c
index 1a6ab78f80..00efe7c84d 100644
--- a/src/modules/mail/e-mail-shell-view-actions.c
+++ b/src/modules/mail/e-mail-shell-view-actions.c
@@ -20,6 +20,8 @@
 
 #include "evolution-config.h"
 
+#include "mail/e-mail-folder-sort-order-dialog.h"
+
 #include "e-mail-shell-view-private.h"
 
 static void
@@ -438,6 +440,36 @@ action_mail_folder_delete_cb (GtkAction *action,
        g_free (selected_folder_name);
 }
 
+static void
+action_mail_folder_edit_sort_order_cb (GtkAction *action,
+                                      EMailShellView *mail_shell_view)
+{
+       EMailView *mail_view;
+       EMFolderTree *folder_tree;
+       CamelStore *store;
+       GtkWidget *dialog;
+       GtkWindow *window;
+       gchar *selected_uri;
+
+       folder_tree = e_mail_shell_sidebar_get_folder_tree (mail_shell_view->priv->mail_shell_sidebar);
+       store = em_folder_tree_ref_selected_store (folder_tree);
+
+       g_return_if_fail (store != NULL);
+
+       selected_uri = em_folder_tree_get_selected_uri (folder_tree);
+
+       mail_view = e_mail_shell_content_get_mail_view (mail_shell_view->priv->mail_shell_content);
+       window = e_mail_reader_get_window (E_MAIL_READER (mail_view));
+
+       dialog = e_mail_folder_sort_order_dialog_new (window, store, selected_uri);
+
+       gtk_dialog_run (GTK_DIALOG (dialog));
+
+       gtk_widget_destroy (dialog);
+       g_object_unref (store);
+       g_free (selected_uri);
+}
+
 static void
 action_mail_folder_expunge_cb (GtkAction *action,
                                EMailShellView *mail_shell_view)
@@ -1598,6 +1630,13 @@ static GtkActionEntry mail_entries[] = {
          N_("Permanently remove this folder"),
          G_CALLBACK (action_mail_folder_delete_cb) },
 
+       { "mail-folder-edit-sort-order",
+         NULL,
+         N_("Edit Sort _Order…"),
+         NULL,
+         N_("Change sort order of the folders in the folder tree"),
+         G_CALLBACK (action_mail_folder_edit_sort_order_cb) },
+
        { "mail-folder-expunge",
          NULL,
          N_("E_xpunge"),
diff --git a/src/modules/mail/e-mail-shell-view-actions.h b/src/modules/mail/e-mail-shell-view-actions.h
index 3a46a492cd..ccd16ae015 100644
--- a/src/modules/mail/e-mail-shell-view-actions.h
+++ b/src/modules/mail/e-mail-shell-view-actions.h
@@ -76,6 +76,8 @@
        E_SHELL_WINDOW_ACTION ((window), "mail-folder-copy")
 #define E_SHELL_WINDOW_ACTION_MAIL_FOLDER_DELETE(window) \
        E_SHELL_WINDOW_ACTION ((window), "mail-folder-delete")
+#define E_SHELL_WINDOW_ACTION_MAIL_FOLDER_EDIT_SORT_ORDER(window) \
+       E_SHELL_WINDOW_ACTION ((window), "mail-folder-edit-sort-order")
 #define E_SHELL_WINDOW_ACTION_MAIL_FOLDER_EXPUNGE(window) \
        E_SHELL_WINDOW_ACTION ((window), "mail-folder-expunge")
 #define E_SHELL_WINDOW_ACTION_MAIL_FOLDER_MARK_ALL_AS_READ(window) \
diff --git a/src/modules/mail/e-mail-shell-view.c b/src/modules/mail/e-mail-shell-view.c
index f7dd766f05..c3221615d5 100644
--- a/src/modules/mail/e-mail-shell-view.c
+++ b/src/modules/mail/e-mail-shell-view.c
@@ -1405,6 +1405,10 @@ mail_shell_view_update_actions (EShellView *shell_view)
        sensitive = folder_is_selected && folder_can_be_deleted;
        gtk_action_set_sensitive (action, sensitive);
 
+       action = ACTION (MAIL_FOLDER_EDIT_SORT_ORDER);
+       sensitive = folder_is_selected || folder_is_store;
+       gtk_action_set_sensitive (action, sensitive);
+
        action = ACTION (MAIL_FOLDER_EXPUNGE);
        sensitive = folder_is_selected && (!folder_is_virtual || 
mail_shell_view->priv->vfolder_allow_expunge);
        gtk_action_set_sensitive (action, sensitive);



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