[gnome-shell] appDisplay: Add drop shadow to icons

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 4e195d789ab99d02a62feb2494ff7f4f2f1ce761
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Aug 31 20:54:37 2020 +0200

    appDisplay: Add drop shadow to icons
    
    The shadow is barely visible on dark backgrounds, but it's not
    wrong to be consistent with Settings, Software and GNOME Classic.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3123

 js/ui/appDisplay.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index c1fb1cb201..daaf746933 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -1333,7 +1333,11 @@ var AppSearchProvider = class AppSearchProvider {
                 metas.push({
                     id: app.get_id(),
                     name: app.get_name(),
-                    createIcon: size => app.create_icon_texture(size),
+                    createIcon: size => {
+                        const icon = app.create_icon_texture(size);
+                        icon.add_style_class_name('icon-dropshadow');
+                        return icon;
+                    },
                 });
             } else {
                 let name = this._systemActions.getName(id);
@@ -2495,7 +2499,9 @@ var AppIcon = GObject.registerClass({
     }
 
     _createIcon(iconSize) {
-        return this.app.create_icon_texture(iconSize);
+        const icon = this.app.create_icon_texture(iconSize);
+        icon.add_style_class_name('icon-dropshadow');
+        return icon;
     }
 
     _removeMenuTimeout() {