[mutter] Default to using stage views

[Jonas Ådahl <jadahl src gnome org>]

commit 262e184fe7e9f3d41149ffc4d34424371d0c0102
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Aug 25 12:57:39 2016 +0800

    Default to using stage views
    
    Instead of hiding stage views enablement behind MUTTER_STAGE_VIEWS=1,
    default to enable it, while making it possible to disable using
    MUTTER_STAGE_VIEWS=0 instead.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770366

 src/backends/meta-backend.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/backends/meta-backend.c b/src/backends/meta-backend.c
index 3e603f3..8c97765 100644
--- a/src/backends/meta-backend.c
+++ b/src/backends/meta-backend.c
@@ -790,9 +790,9 @@ meta_is_stage_views_enabled (void)
   mutter_stage_views = g_getenv ("MUTTER_STAGE_VIEWS");
 
   if (!mutter_stage_views)
-    return FALSE;
+    return TRUE;
 
-  return strcmp (mutter_stage_views, "1") == 0;
+  return !g_str_equal (mutter_stage_views, "0");
 }
 
 MetaInputSettings *