[gtk+/gtk-2-24] combobox: popdown the combobox when on 'grab-broken-event'

[Aleksander Morgado <aleksm src gnome org>]

commit b994bcd4f2e866a6c6d2360cb9b6fe64f1457d41
Author: Aleksander Morgado <aleksander lanedo com>
Date:   Tue Mar 5 16:43:58 2013 +0100

    combobox: popdown the combobox when on 'grab-broken-event'
    
    And also explicitly remove pointer/keyboard grabs from the display.
    
    Whenever the grab is reported lost, we should popdown the combobox, so that the
    GDK_WINDOW_TEMP window is hidden and removed from the toplevel, as done with
    the menu for example.
    
    Leaving the GDK_WINDOW_TEMP window open when re-activating the application
    triggers several issues in the win32 backend, due to restacking windows of the
    non-toplevel group into the toplevel group:
    
    https://bugzilla.gnome.org/show_bug.cgi?id=695200

 gtk/gtkcombobox.c |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcombobox.c b/gtk/gtkcombobox.c
index be968d6..dc912a3 100644
--- a/gtk/gtkcombobox.c
+++ b/gtk/gtkcombobox.c
@@ -2040,6 +2040,19 @@ popup_grab_on_window (GdkWindow *window,
   return FALSE;
 }
 
+static gboolean
+gtk_combo_box_grab_broken_event (GtkWidget          *widget,
+                                 GdkEventGrabBroken *event,
+                                 gpointer            user_data)
+{
+  GtkComboBox *combo_box = GTK_COMBO_BOX (user_data);
+
+  if (event->grab_window == NULL)
+    gtk_combo_box_popdown (combo_box);
+
+  return TRUE;
+}
+
 /**
  * gtk_combo_box_popup:
  * @combo_box: a #GtkComboBox
@@ -2129,6 +2142,11 @@ gtk_combo_box_real_popup (GtkComboBox *combo_box)
     }
 
   gtk_grab_add (priv->popup_window);
+
+  g_signal_connect (priv->popup_window,
+                    "grab-broken-event",
+                    G_CALLBACK (gtk_combo_box_grab_broken_event),
+                    combo_box);
 }
 
 static gboolean
@@ -2158,6 +2176,7 @@ void
 gtk_combo_box_popdown (GtkComboBox *combo_box)
 {
   GtkComboBoxPrivate *priv = combo_box->priv;
+  GdkDisplay *display;
 
   g_return_if_fail (GTK_IS_COMBO_BOX (combo_box));
 
@@ -2171,6 +2190,11 @@ gtk_combo_box_popdown (GtkComboBox *combo_box)
     return;
 
   gtk_grab_remove (priv->popup_window);
+
+  display = gtk_widget_get_display (GTK_WIDGET (combo_box));
+  gdk_display_pointer_ungrab (display, GDK_CURRENT_TIME);
+  gdk_display_keyboard_ungrab (display, GDK_CURRENT_TIME);
+
   gtk_widget_hide_all (priv->popup_window);
   gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (priv->button),
                                 FALSE);