[gtk+] GtkPopover: Ensure we unset modality before unparenting the popover

[Carlos Garnacho <carlosg src gnome org>]

commit 3be4971e05e6aeebeddcd7a38ceebc95330b4f03
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Dec 16 20:25:54 2015 +0100

    GtkPopover: Ensure we unset modality before unparenting the popover
    
    Otherwise the gtk_grab_remove() calls on widget destruction will happen
    on the default window group, which may leave the real window group
    of the popover with a dangling pointer if it is not the default one.
    
    This could be seen on the inspector, open a popover in the properties
    list and close the window with alt-F4.

 gtk/gtkpopover.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkpopover.c b/gtk/gtkpopover.c
index 4c55577..53f004e 100644
--- a/gtk/gtkpopover.c
+++ b/gtk/gtkpopover.c
@@ -188,6 +188,8 @@ static void gtk_popover_update_relative_to (GtkPopover *popover,
 static void gtk_popover_set_state          (GtkPopover *popover,
                                             guint       state);
 static void gtk_popover_invalidate_borders (GtkPopover *popover);
+static void gtk_popover_apply_modality     (GtkPopover *popover,
+                                            gboolean    modal);
 
 G_DEFINE_TYPE_WITH_PRIVATE (GtkPopover, gtk_popover, GTK_TYPE_BIN)
 
@@ -329,6 +331,9 @@ gtk_popover_dispose (GObject *object)
   GtkPopover *popover = GTK_POPOVER (object);
   GtkPopoverPrivate *priv = popover->priv;
 
+  if (priv->modal)
+    gtk_popover_apply_modality (popover, FALSE);
+
   if (priv->window)
     {
       g_signal_handlers_disconnect_by_data (priv->window, popover);