Bug fix: Fix a BadRegion error with --glx-use-copysubbuffermesa

Just a small and mostly harmless issue. Sorry, didn't test throughly.

1 files changed, 1 insertions, 1 deletions

diff --git a/compton.c b/compton.c
index d5989d668..a97ca17c9 100644
--- a/compton.c
+++ b/compton.c
@@ -1614,7 +1614,7 @@ paint_all(session_t *ps, XserverRegion region, XserverRegion region_real, win *t
 #endif
 
   if (!region) {
-    region = get_screen_region(ps);
+    region_real = region = get_screen_region(ps);
   }
   else {
     // Remove the damaged area out of screen