[gnome-shell/wip/exalm/gestures: 11/12] workspaceAnimation: Use window clones



commit a52a6cd7902118b394c9e2a3aeb173785d7bbdcc
Author: Alexander Mikhaylenko <alexm gnome org>
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.
    
    Fixes https://gitlab.gnome.org/GNOME/mutter/issues/929
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/605

 js/ui/workspaceAnimation.js | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)
---
diff --git a/js/ui/workspaceAnimation.js b/js/ui/workspaceAnimation.js
index ddbc941e23..ddd0d4ba62 100644
--- a/js/ui/workspaceAnimation.js
+++ b/js/ui/workspaceAnimation.js
@@ -49,15 +49,19 @@ class WorkspaceGroup extends Clutter.Actor {
         windows = windows.filter(w => this._shouldShowWindow(w.meta_window));
 
         for (let window of windows) {
-            let record = {
-                window,
-                parent: window.get_parent(),
-            };
+            let clone = new Clutter.Clone({
+                source: window,
+                x: window.x,
+                y: window.y,
+            });
+
+            this.add_actor(clone);
+            window.hide();
 
-            record.parent.remove_child(window);
-            this.add_child(window);
+            let record = { window, clone };
 
             record.windowDestroyId = window.connect('destroy', () => {
+                clone.destroy();
                 this._windows.splice(this._windows.indexOf(record), 1);
             });
 
@@ -70,12 +74,11 @@ class WorkspaceGroup extends Clutter.Actor {
             let w = this._windows[i];
 
             w.window.disconnect(w.windowDestroyId);
-            this.remove_child(w.window);
-            w.parent.add_child(w.window);
+            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 = [];


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