Revert "Merge from vscode 81d7885dc2e9dc617e1522697a2966bc4025a45d (#5949)" (#5983)

This reverts commit d15a3fcc98.

src/vs/workbench/api/browser/mainThreadMessageService.ts

@@ -90,8 +90,7 @@ export class MainThreadMessageService implements MainThreadMessageServiceShape {
 			// if promise has not been resolved yet, now is the time to ensure a return value
 			// otherwise if already resolved it means the user clicked one of the buttons
 			Event.once(messageHandle.onDidClose)(() => {
-				dispose(primaryActions);
-				dispose(secondaryActions);
+				dispose(...primaryActions, ...secondaryActions);
 				resolve(undefined);
 			});
 		});