From 61fb62f969abf882ae6232f48623342b7cbfc356 Mon Sep 17 00:00:00 2001
From: "Owen W. Taylor" <otaylor@fishsoup.net>
Date: Thu, 4 Feb 2016 13:13:13 -0500
Subject: [PATCH] Restart: fix maximized windows flickering to the wrong struts

When we restart, we need to update the struts for the screen before
we enter the main loop, or maximized windows will get resized to the
size of the screen without struts, then resized back.

A workaround is needed for a Clutter bug that occurs when we get
the size of an actor before the first paint of the stage.

https://bugzilla.gnome.org/show_bug.cgi?id=761566
---
 js/ui/layout.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/js/ui/layout.js b/js/ui/layout.js
index 7ec686709..9d481cf0b 100644
--- a/js/ui/layout.js
+++ b/js/ui/layout.js
@@ -591,7 +591,10 @@ const LayoutManager = new Lang.Class({
         this.addChrome(this._coverPane);
 
         if (Meta.is_restart()) {
-            // On restart, we don't do an animation
+            // On restart, we don't do an animation. Force an update of the
+            // regions immediately so that maximized windows restore to the
+            // right size taking struts into account.
+            this._updateRegions();
         } else if (Main.sessionMode.isGreeter) {
             this.panelBox.translation_y = -this.panelBox.height;
         } else {
@@ -938,6 +941,11 @@ const LayoutManager = new Lang.Class({
         if (Main.modalCount > 0)
             return GLib.SOURCE_REMOVE;
 
+        // Bug workaround - get_transformed_position()/get_transformed_size() don't work after
+        // a change in stage size until the first pick or paint.
+        // https://bugzilla.gnome.org/show_bug.cgi?id=761565
+        global.stage.get_actor_at_pos(Clutter.PickMode.ALL, 0, 0);
+
         let rects = [], struts = [], i;
         let isPopupMenuVisible = global.top_window_group.get_children().some(isPopupMetaWindow);
         let wantsInputRegion = !isPopupMenuVisible;