win32 fallback: Warn if we don't know how to draw a part

diff --git a/gtk/gtkwin32draw.c b/gtk/gtkwin32draw.c
index 0625a41fe8c3f1b46af24a284e75ffa1a39425a4..6c768d2fac2ea6c9758994a174f6a5840a47d5f1 100644 (file)
--- a/gtk/gtkwin32draw.c
+++ b/gtk/gtkwin32draw.c
@@ -129,7 +129,13 @@ gtk_win32_draw_theme_background (cairo_t    *cr,
   theme_part = get_theme_part (class_name, part);
 
   if (theme_part)
-    theme_part->draw_func (cr, part, state, width, height);
+    {
+      theme_part->draw_func (cr, part, state, width, height);
+    }
+  else
+    {
+      g_warning ("No fallback code to draw background for class \"%s\", part %d", class_name, part);
+    }
 }
 
 void