[metacity] screen: unset timeout ID after removal

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 0e569d311556894d30c9677a73954590784083b9
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Sep 28 15:09:31 2017 +0200

    screen: unset timeout ID after removal
    
    Otherwise we may try to remove the now invalid ID again, resulting
    in a warning.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788292

 src/core/screen.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/core/screen.c b/src/core/screen.c
index ccd26c9..52afaf9 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -1436,6 +1436,7 @@ meta_screen_tile_preview_hide (MetaScreen *screen)
 {
   if (screen->tile_preview_timeout_id > 0)
     g_source_remove (screen->tile_preview_timeout_id);
+  screen->tile_preview_timeout_id = 0;
 
   if (screen->tile_preview)
     meta_tile_preview_hide (screen->tile_preview);