revert: "Resolved issue with broken IME composing rect in Windows desktop" (singerdmx#2266)

* revert: Resolved issue with broken IME composing rect in Windows desktop

* Chore: dart format

---------

Co-authored-by: CatHood0 <[email protected]>

Author: CatHood0

lib/src/editor/raw_editor/raw_editor_state_text_input_client_mixin.dart

@@ -112,19 +112,9 @@ mixin RawEditorStateTextInputClientMixin on EditorState
     _textInputConnection!.show();
   }
 
-  TextRange _getComposingRange() {
-    if (_lastKnownRemoteTextEditingValue != null &&
-        _lastKnownRemoteTextEditingValue?.composing.isValid == true) {
-      return _lastKnownRemoteTextEditingValue!.composing;
-    } else if (textEditingValue.composing.isValid == true) {
-      return textEditingValue.composing;
-    } else {
-      return widget.controller.selection;
-    }
-  }
-
   void _updateComposingRectIfNeeded() {
-    final composingRange = _getComposingRange();
+    final composingRange = _lastKnownRemoteTextEditingValue?.composing ??
+        textEditingValue.composing;
     if (hasConnection) {
       assert(mounted);
       final offset = composingRange.isValid ? composingRange.start : 0;