[evince/gnome-3-32] ev-page-action-widget: disconnect notify::document signal in finalize

[Jason Crain <jcrain src gnome org>]

commit 6880e45250b6a16846aae38dfea4a4db23da2fc6
Author: Jason Crain <jcrain src gnome org>
Date:   Mon Apr 22 17:53:56 2019 -0600

    ev-page-action-widget: disconnect notify::document signal in finalize
    
    EvPageActionWidget listens for the notify::document signal, but does not
    disconnect the signal in finalize, so if you enter and exit fullscreen
    mode, which creates and destroys a fullscreen toolbar, then reload the
    document, this results in a calling the signal handler with an invalid
    EvPageActionWidget pointer.
    
    Disconnect the notify::document signal when EvPageActionWidget is
    finalized.
    
    Fixes #789

 libmisc/ev-page-action-widget.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)
---
diff --git a/libmisc/ev-page-action-widget.c b/libmisc/ev-page-action-widget.c
index 0d2e10d5..5274cb73 100644
--- a/libmisc/ev-page-action-widget.c
+++ b/libmisc/ev-page-action-widget.c
@@ -47,7 +47,8 @@ struct _EvPageActionWidget
 
        GtkWidget *entry;
        GtkWidget *label;
-       guint signal_id;
+       gulong signal_id;
+       gulong notify_document_signal_id;
        GtkTreeModel *filter_model;
        GtkTreeModel *model;
 };
@@ -309,9 +310,11 @@ ev_page_action_widget_set_model (EvPageActionWidget *action_widget,
                                   (gpointer)&action_widget->doc_model);
 
         ev_page_action_widget_set_document (action_widget, ev_document_model_get_document (model));
-       g_signal_connect (model, "notify::document",
-                         G_CALLBACK (ev_page_action_widget_document_changed_cb),
-                         action_widget);
+
+       action_widget->notify_document_signal_id =
+               g_signal_connect (model, "notify::document",
+                                 G_CALLBACK (ev_page_action_widget_document_changed_cb),
+                                 action_widget);
 }
 
 static void
@@ -325,6 +328,11 @@ ev_page_action_widget_finalize (GObject *object)
                                                     action_widget->signal_id);
                        action_widget->signal_id = 0;
                }
+               if (action_widget->notify_document_signal_id > 0) {
+                       g_signal_handler_disconnect (action_widget->doc_model,
+                                                    action_widget->notify_document_signal_id);
+                       action_widget->notify_document_signal_id = 0;
+               }
                g_object_remove_weak_pointer (G_OBJECT (action_widget->doc_model),
                                              (gpointer)&action_widget->doc_model);
                action_widget->doc_model = NULL;