paste for runtime and editor

com.unity.uiwidgets/Editor/UIWidgetsEditorPanel.cs

 using System.Collections.Generic;
 using Unity.UIWidgets.engine;
 using Unity.UIWidgets.foundation;
-using Unity.UIWidgets.gestures;
 using Unity.UIWidgets.ui;
 using UnityEditor;
 using UnityEngine;
         }
 
         void Input_OnGUIEvent(Event evt) {
-            Debug.Log(evt);
             if (evt.type == EventType.MouseDown) {
                 var pos = _getPointerPosition(position: evt.mousePosition);
                 _wrapper.OnPointerDown(pos: pos, _buttonToPointerId(buttonId: evt.button));
                 delta.y /= 3f;
                 var pos = _getPointerPosition(position: evt.mousePosition);
                 _wrapper.OnMouseScroll(delta: delta, pos: pos);
-            }
+            } 
-            } else if (evt.type == EventType.ValidateCommand && evt.commandName == "Paste") {
-                foreach (var character in GUIUtility.systemCopyBuffer) {
-                    var splitEvent = new Event();
-                    splitEvent.type = EventType.KeyDown;
-                    splitEvent.character = character;
-                    PointerEventConverter.KeyEvent.Enqueue(splitEvent);
-                }
-            }
+            } 
         }
 
         protected virtual void main() {

com.unity.uiwidgets/Runtime/engine/UIWidgetsPanel.cs

 using System.IO;
 using Unity.UIWidgets.external.simplejson;
 using Unity.UIWidgets.foundation;
-using Unity.UIWidgets.gestures;
-using Unity.UIWidgets.rendering;
-using Unity.UIWidgets.widgets;
-using UnityEngine.Profiling;
-using UnityEngine.Scripting;
 using UnityEngine.UI;
 using Path = System.IO.Path;
 using RawImage = UnityEngine.UI.RawImage;
             var e = Event.current;
             if (e.isKey) {
                 _wrapper.OnKeyDown(e: e);
-            } else if (e.type == EventType.ValidateCommand && e.commandName == "Paste") {
-                foreach (var character in GUIUtility.systemCopyBuffer) {
-                    var splitEvent = new Event();
-                    splitEvent.type = EventType.KeyDown;
-                    splitEvent.character = character;
-                    PointerEventConverter.KeyEvent.Enqueue(splitEvent);
-                }
             }
         }
 

com.unity.uiwidgets/Runtime/engine/UIWidgetsPanelWrapper.cs

 using System;
 using System.Collections.Generic;
-using System.IO;
-using Unity.UIWidgets.engine;
-using Path = Unity.UIWidgets.ui.Path;
 
 namespace Unity.UIWidgets.engine {
     #region Platform: MacOs/iOS/Windows Specific Functionalities
 
         public void OnKeyDown(Event e) {
             UIWidgetsPanel_onKey(ptr: _ptr, keyCode: e.keyCode, e.type == EventType.KeyDown);
-            if (e.character != 0 || e.keyCode == KeyCode.Backspace) {
+            if (e.type == EventType.KeyDown && e.keyCode == KeyCode.V && 
+                     e.modifiers == EventModifiers.Command) {
+                foreach (var character in GUIUtility.systemCopyBuffer) {
+                    var splitEvent = new Event();
+                    splitEvent.type = EventType.KeyDown;
+                    splitEvent.character = character;
+                    PointerEventConverter.KeyEvent.Enqueue(splitEvent);
+                }
+            } else if (e.character != 0 || e.keyCode == KeyCode.Backspace) {
                 PointerEventConverter.KeyEvent.Enqueue(new Event(other: e));
                 // TODO: add on char
                 // UIWidgetsPanel_onChar(_ptr, e.character);