[metacity] screen: don't grab the server when managing the screen

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 407af3ef533e586642ef392bc116b3535cc67832
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Mar 5 17:15:10 2017 +0200

    screen: don't grab the server when managing the screen
    
    https://git.gnome.org/browse/mutter/commit/?id=577624adefc73d8f724a9e7319ac8087d9bae825

 src/core/screen.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/src/core/screen.c b/src/core/screen.c
index 2bf00db..27ea507 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -752,8 +752,6 @@ meta_screen_manage_all_windows (MetaScreen *screen)
   GList *windows;
   GList *list;
 
-  meta_display_grab (screen->display);
-
   windows = list_windows (screen);
 
   meta_stack_freeze (screen->stack);
@@ -780,8 +778,6 @@ meta_screen_manage_all_windows (MetaScreen *screen)
 
   g_list_foreach (windows, (GFunc)g_free, NULL);
   g_list_free (windows);
-
-  meta_display_ungrab (screen->display);
 }
 
 void