debug: When debug-printing, treat NULL as the default display

Otherwise we lose debug prints from all code that allows NULL displays.

diff --git a/gtk/gtkmain.c b/gtk/gtkmain.c
index 631c308e2df0416cbff46ad0ca56a025cd598bb3..394cd04232090fbe865bc14677561b3fbadd942f 100644 (file)
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -687,6 +687,9 @@ gtk_get_display_debug_flags (GdkDisplay *display)
 {
   gint i;
 
+  if (display == NULL)
+    display = gdk_display_get_default ();
+
   for (i = 0; i < N_DEBUG_DISPLAYS; i++)
     {
       if (debug_flags[i].display == display)