fix(frontend): mfmFunctionPickerを使用して挿入する際のハンドリングを改善 (#17018)

* fix(frontend): mfmFunctionPickerを使用して絵文字を挿入する際のハンドリングを改善

* fix

* Update MkPostForm.vue

* Update Changelog

---------

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

packages/frontend/src/os.ts

@@ -654,6 +654,7 @@ export function popupMenu(items: (MenuItem | null)[], anchorElement?: HTMLElemen
 	align?: string;
 	width?: number;
 	onClosing?: () => void;
+	onClosed?: () => void;
 }): Promise<void> {
 	if (!(anchorElement instanceof HTMLElement)) {
 		anchorElement = null;
@@ -672,6 +673,7 @@ export function popupMenu(items: (MenuItem | null)[], anchorElement?: HTMLElemen
 				resolve();
 				dispose();
 				returnFocusTo = null;
+				options?.onClosed?.();
 			},
 			closing: () => {
 				options?.onClosing?.();