[gnome-shell/wip/exalm/gestures: 12/13] workspaceAnimation: Use window clones

[Alexander Mikhaylenko <alexm src gnome org>]

commit 4e81bfb608b55a8b9632e9f29d42097f937d3a90
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Thu Jul 4 23:15:15 2019 +0500

    workspaceAnimation: Use window clones
    
    Instead of reparenting windows, clone them. This will allow to properly
    support multi-monitor setups in subsequent commits.
    
    Block window mapping animation while the animation is running to prevent
    new windows appearing during the animation from being visible at the same
    time as their clones.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/605

 js/ui/workspaceAnimation.js | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)
---
diff --git a/js/ui/workspaceAnimation.js b/js/ui/workspaceAnimation.js
index 6568666fcc..7aaa0587b4 100644
--- a/js/ui/workspaceAnimation.js
+++ b/js/ui/workspaceAnimation.js
@@ -47,12 +47,18 @@ class WorkspaceGroup extends Clutter.Actor {
         windows = windows.filter(w => this._shouldShowWindow(w.meta_window));
 
         for (let window of windows) {
-            let record = { window: window,
-                           parent: window.get_parent() };
+            let clone = new Clutter.Clone({ source: window,
+                                            x: window.x,
+                                            y: window.y });
+
+            this.add_actor(clone);
+            window.hide();
 
-            window.reparent(this);
+            let record = { window: window,
+                           clone: clone };
 
             record.windowDestroyId = window.connect('destroy', () => {
+                clone.destroy();
                 this._windows.splice(this._windows.indexOf(record), 1);
             });
 
@@ -65,11 +71,11 @@ class WorkspaceGroup extends Clutter.Actor {
             let w = this._windows[i];
 
             w.window.disconnect(w.windowDestroyId);
-            w.window.reparent(w.parent);
+            w.clone.destroy();
 
-            if (w.window.get_meta_window().get_workspace() !=
+            if (w.window.get_meta_window().get_workspace() ==
                 global.workspace_manager.get_active_workspace())
-                w.window.hide();
+                w.window.show();
         }
 
         this._windows = [];