[gtk+/gtk-3-20] GtkWindow: Ensure the toplevel is realized before realizing popovers

[Carlos Garnacho <carlosg src gnome org>]

commit 5863a41f37bc2ba084068e295895f881b366bed6
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Apr 14 11:05:00 2016 +0200

    GtkWindow: Ensure the toplevel is realized before realizing popovers
    
    Otherwise those get a NULL parent window, which is toplevel-y enough
    to disembody the popover.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=764060

 gtk/gtkwindow.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index fc18b68..6eac456 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -12291,7 +12291,8 @@ _gtk_window_set_popover_position (GtkWindow                   *window,
   data->rect = *rect;
   data->pos = pos;
 
-  if (gtk_widget_is_visible (popover) && !data->window)
+  if (gtk_widget_is_visible (popover) && !data->window &&
+      gtk_widget_get_realized (GTK_WIDGET (window)))
     {
       popover_realize (popover, data, window);
       popover_map (popover, data);