[gnome-shell] workspacesView: Work around spurious allocation changes

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 6cc19ee6f05102baef39b8a1bec73eff06699879
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Jul 12 03:26:51 2019 +0000

    workspacesView: Work around spurious allocation changes
    
    For some reason, people are still seeing those after commit d5ebd8c8.
    While this is something we really should figure out, we can work around
    the issue by keeping the view actors hidden until the update is complete.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/issues/1065

 js/ui/workspacesView.js | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/js/ui/workspacesView.js b/js/ui/workspacesView.js
index 7aa976ef3..1cae5761d 100644
--- a/js/ui/workspacesView.js
+++ b/js/ui/workspacesView.js
@@ -638,10 +638,15 @@ var WorkspacesDisplay = class {
                                                this._scrollValueChanged.bind(this));
             }
 
+            // HACK: Avoid spurious allocation changes while updating views
+            view.actor.hide();
+
             this._workspacesViews.push(view);
             Main.layoutManager.overviewGroup.add_actor(view.actor);
         }
 
+        this._workspacesViews.forEach(v => v.actor.show());
+
         this._updateWorkspacesFullGeometry();
         this._updateWorkspacesActualGeometry();
     }