Popup Menu: fixes last selected item still focused bug.
Popup Menu: fixes last selected item still focused bug.

* When you selected a menu item, and then later open that popup menu again,
  that last selected item has focus. Now that focus is reset when the user
  selected a menu item.

Another loooong overdue bug fix.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI