[gnome-shell] screenshot: Always raise UI to top when opening

[Marge Bot <marge-bot src gnome org>]

commit d14bb7b536625605e9e208650c817d698cfc5bb2
Author: Alynx Zhou <alynx zhou gmail com>
Date:   Mon Jul 4 12:01:41 2022 +0800

    screenshot: Always raise UI to top when opening
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2331>

 js/ui/screenshot.js | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/js/ui/screenshot.js b/js/ui/screenshot.js
index a84cd0a44b..bdbf7134fe 100644
--- a/js/ui/screenshot.js
+++ b/js/ui/screenshot.js
@@ -1506,6 +1506,10 @@ var ScreenshotUI = GObject.registerClass({
         // pop their grabs.
         Main.layoutManager.emit('system-modal-opened');
 
+        const { screenshotUIGroup } = Main.layoutManager;
+        screenshotUIGroup.get_parent().set_child_above_sibling(
+            screenshotUIGroup, null);
+
         const grabResult = this._grabHelper.grab({
             actor: this,
             onUngrab: () => this.close(),