fix: last timeout in queueTrigger() never clears map (#7964)

Author: gjanblaszczyk

src/js/event-target.js

@@ -196,6 +196,7 @@ EventTarget.prototype.queueTrigger = function(event) {
   window.clearTimeout(oldTimeout);
 
   const timeout = window.setTimeout(() => {
+    map.delete(type);
     // if we cleared out all timeouts for the current target, delete its map
     if (map.size === 0) {
       map = null;