Invalidate mouse position when releasing last touch finger

Author: frenzibyte

osu.Framework/Input/InputManager.cs

@@ -794,6 +794,7 @@ protected virtual bool HandleMouseTouchStateChange(TouchStateChangeEvent e)
             if (!MapMouseToLatestTouch)
                 return false;
 
+            // Update mouse position state
             if (e.IsActive == true || e.LastPosition != null)
             {
                 new MousePositionAbsoluteInputFromTouch(e)
@@ -802,6 +803,7 @@ protected virtual bool HandleMouseTouchStateChange(TouchStateChangeEvent e)
                 }.Apply(CurrentState, this);
             }
 
+            // Update mouse button state
             if (e.IsActive != null)
             {
                 if (e.IsActive == true)
@@ -812,6 +814,11 @@ protected virtual bool HandleMouseTouchStateChange(TouchStateChangeEvent e)
                 updateTouchMouseLeft(e);
             }
 
+            // Invalidate mouse position if releasing last touch. This is done after updating button state
+            // for click events to be processed on the targeted input queue before the position is invalidated.
+            if (e.IsActive == false && !e.State.Touch.ActiveSources.HasAnyButtonPressed)
+                new MouseInvalidatePositionInputFromTouch(e).Apply(CurrentState, this);
+
             updateTouchMouseRight(e);
             return true;
         }
@@ -827,6 +834,7 @@ private void updateTouchMouseLeft(TouchStateChangeEvent e)
         private void updateTouchMouseRight(TouchStateChangeEvent e)
         {
             if (!AllowRightClickFromLongTouch)
+                // fix this thing, make it cancel touch.
                 return;
 
             // if a touch was pressed/released in this event, reset gesture validity state.