mpris: stop position timer when control center is hidden

src/controlCenter/widgets/mpris/mpris.vala

@@ -265,6 +265,12 @@ namespace XimperShellNotificationCenter.Widgets.Mpris {
                 carousel.get_nth_page (position), true);
         }
 
+        public override void on_cc_visibility_change (bool val) {
+            players.foreach ((name, player) => {
+                player.set_cc_visible (val);
+            });
+        }
+
         private bool is_blacklisted (string name) {
             foreach (string blacklistedPattern in mpris_config.blacklist) {
                 if (blacklistedPattern == null || blacklistedPattern.length == 0) {

src/controlCenter/widgets/mpris/mpris_player.vala

@@ -221,6 +221,14 @@ namespace XimperShellNotificationCenter.Widgets.Mpris {
             }
         }
 
+        public void set_cc_visible (bool visible) {
+            if (visible) {
+                sync_playback_timer ();
+            } else {
+                stop_position_timer ();
+            }
+        }
+
         public void before_destroy () {
             stop_position_timer ();
             source.properties_changed.disconnect (