Mac: QMenu does not update while pressing and hovering with tablet

1. Run the sample app.
2. Using a Wacom tablet, press anywhere in the window to make a menu popup. Do not release the press.
3. Without releasing the press, hover the cursor over the menu choices. They do not highlight.

For extra context, rebuild the sample app with the "WORKS" in main.cpp defined to 1. This will make it use a QWidget instead of a QWindow + window container. Doing the same steps as above, the menus work as expected.

Not reproducible on Linux. Also see an attached patch that fixes the problem.