fix cursor

Runtime/rendering/editable.cs

-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using Unity.UIWidgets.foundation;
 using Unity.UIWidgets.gestures;
 using Unity.UIWidgets.painting;
 
         public void handleTapDown(TapDownDetails details) {
             this._lastTapDownPosition = details.globalPosition - this._paintOffset;
+            if (!Application.isMobilePlatform) {
+                this._selectForTap(this._lastTapDownPosition);
+            }
-            if (this.onSelectionChanged != null) {
-                var position = this._textPainter.getPositionForOffset(this.globalToLocal(this._lastTapDownPosition));
-                this.onSelectionChanged(TextSelection.fromPosition(position), this, SelectionChangedCause.tap);
+            if (Application.isMobilePlatform) {
+                this._selectForTap(this._lastTapDownPosition);
             }
         }
 
             return new TextSelection(baseOffset: word.start, extentOffset: word.end);
         }
 
+        void _selectForTap(Offset pointerPosition) {
+            if (this.onSelectionChanged != null) {
+                var position = this._textPainter.getPositionForOffset(this.globalToLocal(pointerPosition));
+                this.onSelectionChanged(TextSelection.fromPosition(position), this, SelectionChangedCause.tap);
+            }
+        }
+        
         bool _isMultiline {
             get { return this._maxLines != 1; }
         }

Runtime/widgets/editable_text.cs

 
             this._hideSelectionOverlayIfNeeded();
 
-            if (this.widget.selectionControls != null && !this._unityKeyboard()) {
+            if (this.widget.selectionControls != null && Application.isMobilePlatform && !this._unityKeyboard()) {
                 this._selectionOverlay = new TextSelectionOverlay(
                     context: this.context,
                     value: this._value,