[gnome-shell] panel: Consider visibility changes for solid style

[Florian Müllner <fmuellner src gnome org>]

commit 292ac413c80f3fdd907dec14468638647de2466e
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Jun 20 10:16:05 2017 +0200

    panel: Consider visibility changes for solid style
    
    We currently assume that window state changes are accompanied by an
    allocation change (triggered for example by the minimize animation).
    However this misses the case where a window actor is simply hidden
    without any transition, as is the case with the 'show-desktop' action
    for instance, so start tracking plain visibility changes as well.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=783975

 js/ui/panel.js |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/js/ui/panel.js b/js/ui/panel.js
index 83fda0e..52c89d7 100644
--- a/js/ui/panel.js
+++ b/js/ui/panel.js
@@ -823,12 +823,17 @@ const Panel = new Lang.Class({
     },
 
     _onWindowActorAdded: function(container, metaWindowActor) {
-        let signalId = metaWindowActor.connect('allocation-changed', Lang.bind(this, 
this._updateSolidStyle));
-        this._trackedWindows.set(metaWindowActor, signalId);
+        let signalIds = [];
+        ['allocation-changed', 'notify::visible'].forEach(s => {
+            signalIds.push(metaWindowActor.connect(s, Lang.bind(this, this._updateSolidStyle)));
+        });
+        this._trackedWindows.set(metaWindowActor, signalIds);
     },
 
     _onWindowActorRemoved: function(container, metaWindowActor) {
-        metaWindowActor.disconnect(this._trackedWindows.get(metaWindowActor));
+        this._trackedWindows.get(metaWindowActor).forEach(id => {
+            metaWindowActor.disconnect(id);
+        });
         this._trackedWindows.delete(metaWindowActor);
         this._updateSolidStyle();
     },