[evolution] I#979 - Undeletable empty item in folder list

[Milan Crha <mcrha src gnome org>]

commit 22c04d4183918b0ed0d8dee80b3b2b0d66463a29
Author: Milan Crha <mcrha redhat com>
Date:   Thu Jun 18 09:54:55 2020 +0200

    I#979 - Undeletable empty item in folder list
    
    Closes https://gitlab.gnome.org/GNOME/evolution/-/issues/979

 src/mail/em-folder-tree-model.c | 34 +++++++++++++++++++---------------
 src/mail/em-folder-tree-model.h |  2 +-
 src/mail/em-folder-tree.c       |  5 ++---
 3 files changed, 22 insertions(+), 19 deletions(-)
---
diff --git a/src/mail/em-folder-tree-model.c b/src/mail/em-folder-tree-model.c
index d43fb1e1c4..0d3e50fedc 100644
--- a/src/mail/em-folder-tree-model.c
+++ b/src/mail/em-folder-tree-model.c
@@ -1385,7 +1385,7 @@ em_folder_tree_model_set_session (EMFolderTreeModel *model,
        g_object_notify (G_OBJECT (model), "session");
 }
 
-void
+gboolean
 em_folder_tree_model_set_folder_info (EMFolderTreeModel *model,
                                       GtkTreeIter *iter,
                                       CamelStore *store,
@@ -1414,18 +1414,18 @@ em_folder_tree_model_set_folder_info (EMFolderTreeModel *model,
        gboolean folder_is_outbox = FALSE;
        gchar *uri;
 
-       g_return_if_fail (EM_IS_FOLDER_TREE_MODEL (model));
-       g_return_if_fail (iter != NULL);
-       g_return_if_fail (CAMEL_IS_STORE (store));
-       g_return_if_fail (fi != NULL);
+       g_return_val_if_fail (EM_IS_FOLDER_TREE_MODEL (model), FALSE);
+       g_return_val_if_fail (iter != NULL, FALSE);
+       g_return_val_if_fail (CAMEL_IS_STORE (store), FALSE);
+       g_return_val_if_fail (fi != NULL, FALSE);
 
        si = folder_tree_model_store_index_lookup (model, store);
-       g_return_if_fail (si != NULL);
+       g_return_val_if_fail (si != NULL, FALSE);
 
        /* Make sure we don't already know about it. */
        if (g_hash_table_lookup (si->full_hash, fi->full_name)) {
                store_info_unref (si);
-               return;
+               return FALSE;
        }
 
        if (!si->loaded)
@@ -1568,7 +1568,7 @@ em_folder_tree_model_set_folder_info (EMFolderTreeModel *model,
                g_signal_emit (model, signals[LOADED_ROW], 0, path, iter);
                g_signal_emit (model, signals[LOADING_ROW], 0, path, iter);
                gtk_tree_path_free (path);
-               return;
+               return TRUE;
        }
 
        if (fi->child) {
@@ -1587,8 +1587,9 @@ em_folder_tree_model_set_folder_info (EMFolderTreeModel *model,
                                emitted = TRUE;
                        }
 
-                       em_folder_tree_model_set_folder_info (
-                               model, &sub, store, fi, fully_loaded);
+                       if (!em_folder_tree_model_set_folder_info (model, &sub, store, fi, fully_loaded))
+                               gtk_tree_store_remove (tree_store, &sub);
+
                        fi = fi->next;
                } while (fi);
        }
@@ -1598,6 +1599,8 @@ em_folder_tree_model_set_folder_info (EMFolderTreeModel *model,
                g_signal_emit (model, signals[LOADED_ROW], 0, path, iter);
                gtk_tree_path_free (path);
        }
+
+       return TRUE;
 }
 
 static void
@@ -1676,8 +1679,9 @@ folder_tree_model_folder_renamed_cb (CamelStore *store,
        gtk_tree_path_free (path);
 
        gtk_tree_store_append (GTK_TREE_STORE (model), &iter, &root);
-       em_folder_tree_model_set_folder_info (
-               EM_FOLDER_TREE_MODEL (model), &iter, store, info, TRUE);
+
+       if (!em_folder_tree_model_set_folder_info (EM_FOLDER_TREE_MODEL (model), &iter, store, info, TRUE))
+               gtk_tree_store_remove (GTK_TREE_STORE (model), &iter);
 }
 
 static void
@@ -1741,9 +1745,9 @@ folder_tree_model_folder_subscribed_cb (CamelStore *store,
 
        gtk_tree_store_append (GTK_TREE_STORE (model), &iter, &parent);
 
-       em_folder_tree_model_set_folder_info (
-               EM_FOLDER_TREE_MODEL (model), &iter, store, fi,
-               (fi->flags & (CAMEL_FOLDER_NOINFERIORS | CAMEL_FOLDER_NOCHILDREN)) != 0);
+       if (!em_folder_tree_model_set_folder_info (EM_FOLDER_TREE_MODEL (model), &iter, store, fi,
+               (fi->flags & (CAMEL_FOLDER_NOINFERIORS | CAMEL_FOLDER_NOCHILDREN)) != 0))
+               gtk_tree_store_remove (GTK_TREE_STORE (model), &iter);
 }
 
 static void
diff --git a/src/mail/em-folder-tree-model.h b/src/mail/em-folder-tree-model.h
index 1402144e4c..45784278be 100644
--- a/src/mail/em-folder-tree-model.h
+++ b/src/mail/em-folder-tree-model.h
@@ -123,7 +123,7 @@ EMailSession *      em_folder_tree_model_get_session
 void           em_folder_tree_model_set_session
                                        (EMFolderTreeModel *model,
                                         EMailSession *session);
-void           em_folder_tree_model_set_folder_info
+gboolean       em_folder_tree_model_set_folder_info
                                        (EMFolderTreeModel *model,
                                         GtkTreeIter *iter,
                                         CamelStore *store,
diff --git a/src/mail/em-folder-tree.c b/src/mail/em-folder-tree.c
index 39871c6f1f..b4eab4f9f8 100644
--- a/src/mail/em-folder-tree.c
+++ b/src/mail/em-folder-tree.c
@@ -363,9 +363,8 @@ folder_tree_get_folder_info_cb (CamelStore *store,
                                                GTK_TREE_STORE (model),
                                                &iter, &root);
 
-                               em_folder_tree_model_set_folder_info (
-                                       EM_FOLDER_TREE_MODEL (model),
-                                       &iter, store, child_info, TRUE);
+                               if (!em_folder_tree_model_set_folder_info (EM_FOLDER_TREE_MODEL (model), 
&iter, store, child_info, TRUE))
+                                       gtk_tree_store_remove (GTK_TREE_STORE (model), &iter);
                        }
 
                        child_info = child_info->next;