Feature - Prevents multiple audio/video attachments from being played at the same time (#24717)

app/javascript/mastodon/reducers/media_attachments.js

@@ -2,6 +2,13 @@ import { Map as ImmutableMap } from 'immutable';
 
 import { STORE_HYDRATE } from '../actions/store';
 
+export let currentMedia = null;
+
+export function setCurrentMedia(value) {
+  currentMedia = value;
+}
+
+
 const initialState = ImmutableMap({
   accept_content_types: [],
 });