[gnome-shell] panel: Center app icon

[Florian Müllner <fmuellner src gnome org>]

commit a9d73b10173b00024266fff49a4c3709ca56b93b
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu May 7 14:25:13 2020 +0200

    panel: Center app icon
    
    Giving the icon extra space may distort it, so center it vertically.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2578

 js/ui/panel.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/js/ui/panel.js b/js/ui/panel.js
index 1c6e3f368e..8d9e71872d 100644
--- a/js/ui/panel.js
+++ b/js/ui/panel.js
@@ -214,7 +214,10 @@ var AppMenuButton = GObject.registerClass({
                              this._onIconThemeChanged.bind(this));
 
         let iconEffect = new Clutter.DesaturateEffect();
-        this._iconBox = new St.Bin({ style_class: 'app-menu-icon' });
+        this._iconBox = new St.Bin({
+            style_class: 'app-menu-icon',
+            y_align: Clutter.ActorAlign.CENTER,
+        });
         this._iconBox.add_effect(iconEffect);
         this._container.add_actor(this._iconBox);