Due to how CMake and generated project files are structured, just using
AUTOUIC to pick up Qt `.ui` files will lead to a situation where
changing such a file doesn't trigger a regeneration of the associated
header files and thus a re-build of the target.
Upstream fix still requires `.ui` files to be added as target sources.
CMake issue: https://gitlab.kitware.com/cmake/cmake/-/issues/17959
Qt5X11Extras (QX11Info) was added in
762983b5d853ba8444c4efee450ea872b294060e, but it doesn't seem to
actually be used. Qt6 doesn't yet ship X11Extras, so let's remove it.
Ignore wheelEvent using subclass
slider,spinbox,combobox with eventhandlers:
wheelEvent - ignore if widget is not focused,
leaveEvent - clear focus when mouse leaves event.
Use these new subclass widgets in properties
to ignore wheelEvent when scrolling.
