[mutter] context/test: Respect MUTTER_SYNC envvar

[Marge Bot <marge-bot src gnome org>]

commit 4cd1154b3d9fbd850d8fefcd275db7e2f1fa544b
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue Mar 2 12:04:03 2021 +0100

    context/test: Respect MUTTER_SYNC envvar
    
    It just calls meta_set_syncing() accordingly. Is currently done by
    meta_init() either when the env var is set, or when a command line
    argument is passed.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1861>

 src/tests/meta-context-test.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/tests/meta-context-test.c b/src/tests/meta-context-test.c
index d798d55e45..c5897af2f5 100644
--- a/src/tests/meta-context-test.c
+++ b/src/tests/meta-context-test.c
@@ -91,6 +91,8 @@ meta_context_test_setup (MetaContext  *context,
     settings,
     META_EXPERIMENTAL_FEATURE_SCALE_MONITOR_FRAMEBUFFER);
 
+  meta_set_syncing (!!g_getenv ("MUTTER_SYNC"));
+
   return TRUE;
 }