From e7b9bd75d8498ee3f9f9716282d5739b2936c65f Mon Sep 17 00:00:00 2001
From: Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
Date: Thu, 21 Nov 2019 18:50:11 -0300
Subject: [PATCH] appIcon: Remove drag monitor on destroy

It may happen that the app icon is destroyed with a drag
monitor still around, in which case, a load of warnings
will be shown.

Make sure to remove any pending drag monitor on destroy.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/841
---
 js/ui/appDisplay.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index bc411b029..929caa12b 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -2133,6 +2133,7 @@ var AppIcon = GObject.registerClass({
             });
         }
 
+        this._dragMonitor = null;
         this._itemDragBeginId = Main.overview.connect(
             'item-drag-begin', this._onDragBegin.bind(this));
         this._itemDragEndId = Main.overview.connect(
@@ -2157,6 +2158,12 @@ var AppIcon = GObject.registerClass({
         }
         if (this._stateChangedId > 0)
             this.app.disconnect(this._stateChangedId);
+
+        if (this._dragMonitor) {
+            DND.removeDragMonitor(this._dragMonitor);
+            this._dragMonitor = null;
+        }
+
         if (this._draggable) {
             if (this._dragging)
                 Main.overview.endItemDrag(this);