[gnome-shell/wip/fmuellner/close-dialog-backports: 2/3] closeDialog: Periodically check for window to become responsive again

[Florian Müllner <fmuellner src gnome org>]

commit c41175af4564469486a46c430c3d28e4efb314fb
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon May 21 23:12:35 2018 +0200

    closeDialog: Periodically check for window to become responsive again
    
    The close dialog for non-responding windows is closed automatically
    when we detect that the window is responding again. However as we
    currently only ping the window in response to certain user actions
    (like focusing the window or opening the window menu), this can
    easily go undetected.
    
    Address this by periodically pinging the window while the close
    dialog is shown.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/issues/298

 js/ui/closeDialog.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/js/ui/closeDialog.js b/js/ui/closeDialog.js
index 821480a9c..7943880d8 100644
--- a/js/ui/closeDialog.js
+++ b/js/ui/closeDialog.js
@@ -2,6 +2,7 @@
 
 const Clutter = imports.gi.Clutter;
 const Gio = imports.gi.Gio;
+const GLib = imports.gi.GLib;
 const GObject = imports.gi.GObject;
 const Lang = imports.lang;
 const Meta = imports.gi.Meta;
@@ -13,6 +14,7 @@ const Tweener = imports.ui.tweener;
 
 var FROZEN_WINDOW_BRIGHTNESS = -0.3
 var DIALOG_TRANSITION_TIME = 0.15
+var ALIVE_TIMEOUT = 5000;
 
 var CloseDialog = new Lang.Class({
     Name: 'CloseDialog',
@@ -26,6 +28,7 @@ var CloseDialog = new Lang.Class({
         this.parent();
         this._window = window;
         this._dialog = null;
+        this._timeoutId = 0;
     },
 
     get window() {
@@ -99,6 +102,12 @@ var CloseDialog = new Lang.Class({
 
         Meta.disable_unredirect_for_screen(global.screen);
 
+        this._timeoutId = GLib.timeout_add(GLib.PRIORITY_DEFAULT, ALIVE_TIMEOUT,
+            () => {
+                this._window.check_alive(global.display.get_current_time_roundtrip());
+                return GLib.SOURCE_CONTINUE;
+            });
+
         this._addWindowEffect();
         this._initDialog();
 
@@ -121,6 +130,9 @@ var CloseDialog = new Lang.Class({
 
         Meta.enable_unredirect_for_screen(global.screen);
 
+        GLib.source_remove(this._timeoutId);
+        this._timeoutId = 0;
+
         let dialog = this._dialog;
         this._dialog = null;
         this._removeWindowEffect();