[mutter/wip/tintou/workspace-manager-header] meta: Add missing display.h to meta-workspace-manager.h

[Corentin Noël <corentinnoel src gnome org>]

commit 2804713aec73e0ffd4bccff65682c4c7c8fe62d0
Author: Corentin Noël <corentin elementary io>
Date:   Wed Jan 29 11:02:33 2020 +0100

    meta: Add missing display.h to meta-workspace-manager.h
    
    This is required because MetaDisplayCorner is only defined in display.h
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/1025

 src/meta/meta-workspace-manager.h | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/meta/meta-workspace-manager.h b/src/meta/meta-workspace-manager.h
index 0390c44e2..cb564b370 100644
--- a/src/meta/meta-workspace-manager.h
+++ b/src/meta/meta-workspace-manager.h
@@ -28,6 +28,7 @@
 #include <meta/common.h>
 #include <meta/prefs.h>
 #include <meta/types.h>
+#include <meta/display.h>
 
 #define META_TYPE_WORKSPACE_MANAGER (meta_workspace_manager_get_type ())