Protects player after disposal

Ensures player methods `on` and `trigger` are safely called
after the player has been disposed. The silvermine chromecast
plugin has an interval that may fire after player disposal,
and attempts to call these methods, causing errors.

Author: tzarebczan

ui/component/viewers/videoViewer/internal/chromecast.js

@@ -12,9 +12,9 @@ export default class Chromecast {
    * Actions that need to happen after initializing 'videojs'
    */
   static initialize(player: any) {
-    // --- Wrap player.on to be safe after disposal ---
+    // --- Wrap player methods to be safe after disposal ---
     // The silvermine chromecast plugin has an interval that may fire after player disposal
-    // and try to call player.on(), causing "Invalid target for null#on" errors
+    // and try to call player.on()/trigger(), causing "Invalid target for null#..." errors
     const originalOn = player.on.bind(player);
     player.on = function (...args: any) {
       if (player.isDisposed()) {
@@ -23,6 +23,14 @@ export default class Chromecast {
       return originalOn(...args);
     };
 
+    const originalTrigger = player.trigger.bind(player);
+    player.trigger = function (...args: any) {
+      if (player.isDisposed()) {
+        return player;
+      }
+      return originalTrigger(...args);
+    };
+
     // --- Start plugin ---
     player.chromecast();