add EventSystem.current.IsPointerOverGameObject() check

AwesomeUIWidgets/Assets/Scripts/RaycastableScene/DragRotate.cs

 
         void OnMouseDown()
         {
+            if (EventSystem.current.IsPointerOverGameObject())
+            {
+                return;
+            }
+            
             _lastPosition = mousePosition;
         }
 
 
         private void OnMouseDrag()
         {
+            if (_lastPosition == null)
+            {
+                return;
+            }
             Vector2 direction = mousePosition - _lastPosition.Value;
             _lastPosition = mousePosition;