[file-roller/wip/jtojnar/gtk4: 20/21] Correct return values of signal handlers

[Jan Tojnar <jtojnar src gnome org>]

commit 7c6c1923feffe7ebe731bd6f3b8f731af8c73514
Author: Jan Tojnar <jtojnar gmail com>
Date:   Tue Dec 21 07:18:43 2021 +0100

    Correct return values of signal handlers
    
    I verified using the following semantic patch that there are no signals that return a value in File 
Roller, and very little in GLib and GTK: 
https://gitlab.gnome.org/jtojnar/glib-refactoring/-/blob/5d70945511ce1f924f2f3eae59cb382bf39caeb7/patches/find-non-void-signals.cocci
    
    Then I ran this semantic patch to set return values of all handlers to void:
    
https://gitlab.gnome.org/jtojnar/glib-refactoring/-/blob/a17a83dccb841108a760c7b4a7e26b34cb3231b4/patches/voidize-signal-handlers.cocci
    
    Finally, I checked with Tartan that this transformation did not cause any new errors.

 src/eggtreemultidnd.c | 15 +++++-----
 src/fr-application.c  |  4 +--
 src/fr-command.c      |  4 +--
 src/fr-window.c       | 78 +++++++++++++++++++++++++--------------------------
 4 files changed, 49 insertions(+), 52 deletions(-)
---
diff --git a/src/eggtreemultidnd.c b/src/eggtreemultidnd.c
index 3c43cb2c..6bcecd6c 100644
--- a/src/eggtreemultidnd.c
+++ b/src/eggtreemultidnd.c
@@ -229,7 +229,7 @@ get_context_data (GdkDragContext *context)
 }
 
 
-static gboolean
+static void
 egg_tree_multi_drag_drag_data_get (GtkWidget        *widget,
                                   GdkDragContext   *context,
                                   GtkSelectionData *selection_data,
@@ -243,11 +243,11 @@ egg_tree_multi_drag_drag_data_get (GtkWidget        *widget,
   tree_view = GTK_TREE_VIEW (widget);
   model = gtk_tree_view_get_model (tree_view);
   if (model == NULL)
-    return FALSE;
+    return;
 
   path_list = get_context_data (context);
   if (path_list == NULL)
-    return FALSE;
+    return;
 
   /* We can implement the GTK_TREE_MODEL_ROW target generically for
    * any model; for DragSource models there are some other targets
@@ -255,12 +255,11 @@ egg_tree_multi_drag_drag_data_get (GtkWidget        *widget,
    */
 
   if (! EGG_IS_TREE_MULTI_DRAG_SOURCE (model))
-    return FALSE;
+    return;
 
-  return egg_tree_multi_drag_source_drag_data_get (EGG_TREE_MULTI_DRAG_SOURCE (model),
-                                                  context,
-                                                  selection_data,
-                                                  path_list);
+  egg_tree_multi_drag_source_drag_data_get(EGG_TREE_MULTI_DRAG_SOURCE(model),
+                                           context, selection_data,
+                                           path_list);
 }
 
 
diff --git a/src/fr-application.c b/src/fr-application.c
index abcec378..114f9fb3 100644
--- a/src/fr-application.c
+++ b/src/fr-application.c
@@ -134,7 +134,7 @@ window_ready_cb (FrWindow *window,
 }
 
 
-static gboolean
+static void
 window_progress_cb (FrWindow *window,
                    double    fraction,
                    const char *details,
@@ -152,7 +152,7 @@ window_progress_cb (FrWindow *window,
                                                      details),
                                       NULL);
 
-       return TRUE;
+       return;
 }
 
 
diff --git a/src/fr-command.c b/src/fr-command.c
index 1a271554..377130ce 100644
--- a/src/fr-command.c
+++ b/src/fr-command.c
@@ -385,14 +385,14 @@ fr_command_handle_process_error (FrCommand     *self,
 /* -- _fr_command_set_process -- */
 
 
-static gboolean
+static void
 process_sticky_only_cb (FrProcess *process,
                         gpointer   user_data)
 {
        FrArchive *archive = user_data;
 
        fr_archive_set_stoppable (archive, FALSE);
-        return TRUE;
+        return;
 }
 
 
diff --git a/src/fr-window.c b/src/fr-window.c
index 55bf1fea..963a2821 100644
--- a/src/fr-window.c
+++ b/src/fr-window.c
@@ -2441,7 +2441,7 @@ progress_dialog_update_action_description (FrWindow *window)
 }
 
 
-static gboolean
+static void
 fr_window_working_archive_cb (FrArchive  *archive,
                              const char *archive_uri,
                              FrWindow   *window)
@@ -2451,11 +2451,11 @@ fr_window_working_archive_cb (FrArchive  *archive,
                window->priv->working_archive = g_file_new_for_uri (archive_uri);
        progress_dialog_update_action_description (window);
 
-       return TRUE;
+       return;
 }
 
 
-static gboolean
+static void
 fr_archive_message_cb (FrArchive  *archive,
                       const char *msg,
                       FrWindow   *window)
@@ -2466,7 +2466,7 @@ fr_archive_message_cb (FrArchive  *archive,
        }
 
        if (window->priv->progress_dialog == NULL)
-               return TRUE;
+               return;
 
        if (msg != NULL) {
                while (*msg == ' ')
@@ -2483,7 +2483,7 @@ fr_archive_message_cb (FrArchive  *archive,
                else
                        utf8_msg = g_strdup (msg);
                if (utf8_msg == NULL)
-                       return TRUE;
+                       return;
 
                if (g_utf8_validate (utf8_msg, -1, NULL)) {
                        gtk_label_set_text (GTK_LABEL (window->priv->pd_message), utf8_msg);
@@ -2510,7 +2510,7 @@ fr_archive_message_cb (FrArchive  *archive,
 
        progress_dialog_update_action_description (window);
 
-       return TRUE;
+       return;
 }
 
 
@@ -2654,7 +2654,7 @@ open_progress_dialog (FrWindow *window,
 }
 
 
-static gboolean
+static void
 fr_archive_progress_cb (FrArchive *archive,
                        double     fraction,
                        FrWindow  *window)
@@ -2710,7 +2710,7 @@ fr_archive_progress_cb (FrArchive *archive,
                g_print ("progress > %2.2f\n", fraction);
 #endif
        }
-       return TRUE;
+       return;
 }
 
 
@@ -3717,7 +3717,7 @@ fr_window_current_folder_activated (FrWindow *window,
 }
 
 
-static gboolean
+static void
 row_activated_cb (GtkTreeView       *tree_view,
                  GtkTreePath       *path,
                  GtkTreeViewColumn *column,
@@ -3730,7 +3730,7 @@ row_activated_cb (GtkTreeView       *tree_view,
        if (! gtk_tree_model_get_iter (GTK_TREE_MODEL (window->priv->list_store),
                                       &iter,
                                       path))
-               return FALSE;
+               return;
 
        gtk_tree_model_get (GTK_TREE_MODEL (window->priv->list_store), &iter,
                            COLUMN_FILE_DATA, &fdata,
@@ -3751,7 +3751,7 @@ row_activated_cb (GtkTreeView       *tree_view,
                g_free (new_dir);
        }
 
-       return FALSE;
+       return;
 }
 
 
@@ -4367,31 +4367,29 @@ tree_view_drag_begin (GtkWidget          *widget,
 }
 
 
-static gboolean
+static void
 file_list_drag_begin (GtkWidget          *widget,
                      GdkDragContext     *context,
                      gpointer            data)
 {
        FrWindow *window = data;
-       return tree_view_drag_begin (widget,
-                                    context,
-                                    GTK_TREE_MODEL (window->priv->list_store),
-                                    COLUMN_NAME,
-                                    data);
+       tree_view_drag_begin(widget, context,
+                            GTK_TREE_MODEL(window->priv->list_store),
+                            COLUMN_NAME, data);
+       return;
 }
 
 
-static gboolean
+static void
 folde_tree_drag_begin (GtkWidget          *widget,
                       GdkDragContext     *context,
                       gpointer            data)
 {
        FrWindow *window = data;
-       return tree_view_drag_begin (widget,
-                                    context,
-                                    GTK_TREE_MODEL (window->priv->tree_store),
-                                    TREE_COLUMN_NAME,
-                                    data);
+       tree_view_drag_begin(widget, context,
+                            GTK_TREE_MODEL(window->priv->tree_store),
+                            TREE_COLUMN_NAME, data);
+       return;
 }
 
 
@@ -4572,7 +4570,7 @@ wait_dnd_extraction (FrWindow *window)
 }
 
 
-static gboolean
+static void
 fr_window_folder_tree_drag_data_get (GtkWidget        *widget,
                                     GdkDragContext   *context,
                                     GtkSelectionData *selection_data,
@@ -4590,11 +4588,11 @@ fr_window_folder_tree_drag_data_get (GtkWidget        *widget,
        debug (DEBUG_INFO, "::DragDataGet -->\n");
 
        if (window->priv->activity_ref > 0)
-               return FALSE;
+               return;
 
        file_list = fr_window_get_folder_tree_selection (window, TRUE, NULL);
        if (file_list == NULL)
-               return FALSE;
+               return;
 
        if (gtk_selection_data_get_target (selection_data) == XFR_ATOM) {
                FrClipboardData *tmp;
@@ -4611,14 +4609,14 @@ fr_window_folder_tree_drag_data_get (GtkWidget        *widget,
                fr_clipboard_data_unref (tmp);
                g_free (data);
 
-               return TRUE;
+               return;
        }
 
        if (! nautilus_xds_dnd_is_valid_xds_context (context))
-               return FALSE;
+               return;
 
        uri  = get_xds_atom_value (context);
-       g_return_val_if_fail (uri != NULL, FALSE);
+       g_return_if_fail(uri != NULL);
 
        destination = g_file_new_for_uri (uri);
        destination_folder = g_file_get_parent (destination);
@@ -4667,7 +4665,7 @@ fr_window_folder_tree_drag_data_get (GtkWidget        *widget,
 
        debug (DEBUG_INFO, "::DragDataGet <--\n");
 
-       return TRUE;
+       return;
 }
 
 
@@ -4887,7 +4885,7 @@ key_press_cb (GtkWidget   *widget,
 }
 
 
-static gboolean
+static void
 dir_tree_selection_changed_cb (GtkTreeSelection *selection,
                               gpointer          user_data)
 {
@@ -4905,11 +4903,11 @@ dir_tree_selection_changed_cb (GtkTreeSelection *selection,
                g_free (path);
        }
 
-       return FALSE;
+       return;
 }
 
 
-static gboolean
+static void
 selection_changed_cb (GtkTreeSelection *selection,
                      gpointer          user_data)
 {
@@ -4917,7 +4915,7 @@ selection_changed_cb (GtkTreeSelection *selection,
 
        fr_window_update_sensitivity (window);
 
-       return FALSE;
+       return;
 }
 
 
@@ -5289,7 +5287,7 @@ path_column_sort_func (GtkTreeModel *model,
 }
 
 
-static gboolean
+static void
 fr_window_show_cb (GtkWidget *widget,
                   FrWindow  *window)
 {
@@ -5300,7 +5298,7 @@ fr_window_show_cb (GtkWidget *widget,
 
        gtk_widget_hide (window->priv->filter_bar);
 
-       return TRUE;
+       return;
 }
 
 
@@ -5373,7 +5371,7 @@ theme_changed_cb (GtkIconTheme *theme,
 }
 
 
-static gboolean
+static void
 fr_archive_stoppable_cb (FrArchive *archive,
                         gboolean   stoppable,
                         FrWindow  *window)
@@ -5383,7 +5381,7 @@ fr_archive_stoppable_cb (FrArchive *archive,
                gtk_dialog_set_response_sensitive (GTK_DIALOG (window->priv->progress_dialog),
                                                   GTK_RESPONSE_OK,
                                                   stoppable);
-       return TRUE;
+       return;
 }
 
 
@@ -8045,12 +8043,12 @@ fr_window_archive_encrypt (FrWindow   *window,
 /* -- fr_window_view_last_output  -- */
 
 
-static gboolean
+static void
 last_output_window__unrealize_cb (GtkWidget  *widget,
                                  gpointer    data)
 {
        pref_util_save_window_geometry (GTK_WINDOW (widget), LAST_OUTPUT_SCHEMA_NAME);
-       return FALSE;
+       return;
 }