From 58ed969dd1f71e05d68455cd00369956160b5216 Mon Sep 17 00:00:00 2001
From: Alexander Mikhaylenko <exalm7659@gmail.com>
Date: Fri, 16 Apr 2021 19:17:33 +0500
Subject: [PATCH] background: Check xml mime type instead of extension

This is required to be able to set animated wallpapers with the wallpaper
portal, which names them 'background' without an extension.

See https://gitlab.gnome.org/bertob/nostalgia/-/merge_requests/12

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1816>
---
 js/ui/background.js | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/js/ui/background.js b/js/ui/background.js
index df2d98112..1f7c5e572 100644
--- a/js/ui/background.js
+++ b/js/ui/background.js
@@ -101,6 +101,8 @@ const LoginManager = imports.misc.loginManager;
 const Main = imports.ui.main;
 const Params = imports.misc.params;
 
+Gio._promisify(Gio._LocalFilePrototype, 'query_info_async', 'query_info_finish');
+
 var DEFAULT_BACKGROUND_COLOR = Clutter.Color.from_pixel(0x2e3436ff);
 
 const BACKGROUND_SCHEMA = 'org.gnome.desktop.background';
@@ -479,8 +481,15 @@ var Background = GObject.registerClass({
         }
     }
 
-    _loadFile(file) {
-        if (file.get_basename().endsWith('.xml'))
+    async _loadFile(file) {
+        const info = await file.query_info_async(
+            Gio.FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
+            Gio.FileQueryInfoFlags.NONE,
+            0,
+            null);
+
+        const contentType = info.get_content_type();
+        if (contentType === 'application/xml')
             this._loadAnimation(file);
         else
             this._loadImage(file);