fix: reset composing range if it's collapsed on macOS (#871)

lib/src/editor/editor_component/service/ime/non_delta_input_service.dart

@@ -1,3 +1,4 @@
+import 'dart:io';
 import 'dart:math';
 
 import 'package:appflowy_editor/appflowy_editor.dart';
@@ -192,6 +193,11 @@ class NonDeltaTextInputService extends TextInputService with TextInputClient {
             )
           : delta.composing;
     }
+
+    // solve the issue where the Chinese IME doesn't continue deleting after the input content has been deleted.
+    if (Platform.isMacOS && (composingTextRange?.isCollapsed ?? false)) {
+      composingTextRange = TextRange.empty;
+    }
   }
 }