fix(ags player): get rid of already disposed errors

config/ags/js/media-player/mpris.js

@@ -1,4 +1,5 @@
 const { execAsync, lookUpIcon } = ags.Utils;
+const { Mpris } = ags.Service;
 const { Button, Icon, Label, Stack, Slider, CenterBox } = ags.Widget;
 const { Gdk } = imports.gi;
 const display = Gdk.Display.get_default();
@@ -34,7 +35,9 @@ export const CoverArt = (player, params) => CenterBox({
     [player, box => {
       execAsync(['bash', '-c', `[[ -f "${player.coverPath}" ]] && coloryou "${player.coverPath}"`])
       .then(out => {
-        if (box) {
+        if (!Mpris.players.find(p => player === p))
+          return;
+
         player.colors.value = JSON.parse(out);
 
         box._bgStyle = `background: radial-gradient(circle,
@@ -45,7 +48,6 @@ export const CoverArt = (player, params) => CenterBox({
                         background-position: center;`;
         if (!box.get_parent()._dragging)
           box.setStyle(box._bgStyle);
-        }
       }).catch(err => { if (err !== "") print(err) });
     }],
   ],
@@ -197,6 +199,9 @@ const PlayerButton = ({ player, items, onClick, prop }) => Button({
     }],
 
     [player.colors, button => {
+      if (!Mpris.players.find(p => player === p))
+          return;
+
       if (player.colors.value) {
         if (prop == 'playBackStatus') {
           if (button._hovered) {