Ensure that lastClickEvent is set before handling doubleClick (#23865)

GitOrigin-RevId: 1f080e62e95dc71cec6bcf2f5c9e0cb8bd5f5e2c

services/web/frontend/js/features/source-editor/extensions/bracket-matching.ts

@@ -84,13 +84,13 @@ const chooseEventHandler = () => {
   }
 
   // Store and use the previous click event, as the "dblclick" event can have the wrong position
-  let lastClickEvent: MouseEvent
+  let lastClickEvent: MouseEvent | null = null
 
   return EditorView.domEventHandlers({
     click(evt, view) {
       if (evt.detail === 1) {
         lastClickEvent = evt
-      } else if (evt.detail === 2) {
+      } else if (evt.detail === 2 && lastClickEvent) {
         return handleDoubleClick(lastClickEvent, view)
       }
     },