[gtk/wip/baedert/icontheme: 104/109] main: Check if any debug flags are set in gtk_get_debug_flags()

[Timm Bäder <baedert src gnome org>]

commit 173186c5b262f6fe984f3fb419f13cd039bf0da8
Author: Timm Bäder <mail baedert org>
Date:   Sat May 25 17:38:26 2019 +0200

    main: Check if any debug flags are set in gtk_get_debug_flags()
    
    We end up checking the debug flags for the default display, but that's
    unnecessary if we know that no display has any debug flags set anyway.

 gtk/gtkmain.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkmain.c b/gtk/gtkmain.c
index d4d79f650e..3f50cae95b 100644
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -738,7 +738,10 @@ gtk_set_display_debug_flags (GdkDisplay *display,
 guint
 gtk_get_debug_flags (void)
 {
-  return gtk_get_display_debug_flags (gdk_display_get_default ());
+  if (gtk_get_any_display_debug_flag_set ())
+    return gtk_get_display_debug_flags (gdk_display_get_default ());
+
+  return 0;
 }
 
 /**