[gtk+] widget: Improve early exit checks on queue_draw()

[Benjamin Otte <otte src gnome org>]

commit 3fd63e1d675a6744e3bf42cfec29d0602ba6e500
Author: Benjamin Otte <otte redhat com>
Date:   Tue Oct 18 03:49:09 2016 +0200

    widget: Improve early exit checks on queue_draw()
    
    (1) We don't need to check for realized when we check for mapped right
        below.
    (2) Empty regions don't need to be drawn.

 gtk/gtkwidget.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index c070e14..14ea195 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -5067,7 +5067,7 @@ gtk_widget_queue_draw_region (GtkWidget            *widget,
 
   g_return_if_fail (GTK_IS_WIDGET (widget));
 
-  if (!_gtk_widget_get_realized (widget))
+  if (cairo_region_is_empty (region))
     return;
 
   /* Just return if the widget or one of its ancestors isn't mapped */