处理键盘长按删除 撤销出现的bug

CustomKeyboard/View/KBFunctionView.m

@@ -770,18 +770,21 @@ static void KBULDarwinCallback(CFNotificationCenterRef center, void *observer, C
 - (void)kb_fullAccessChanged {
     dispatch_async(dispatch_get_main_queue(), ^{ [self kb_refreshPasteboardMonitor]; });
 }
-    - (void)onTapDelete {
+
+- (void)onTapDelete {
     NSLog(@"点击：删除");
-    [[KBBackspaceUndoManager shared] registerNonClearAction];
     UIInputViewController *ivc = KBFindInputViewController(self);
     id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
+    [[KBBackspaceUndoManager shared] recordDeletionSnapshotBefore:proxy.documentContextBeforeInput
+                                                             after:proxy.documentContextAfterInput];
     [proxy deleteBackward];
 }
 - (void)onTapClear {
     NSLog(@"点击：清空");
     [self.backspaceHandler performClearAction];
 }
-    - (void)onTapSend {
+
+- (void)onTapSend {
     NSLog(@"点击：发送");
     [[KBBackspaceUndoManager shared] registerNonClearAction];
     // 发送：插入换行。大多数聊天类 App 会把回车视为“发送”