I have a tablet in which all devices are set with "Always Core" so that I
can control my normal pointer with my stylus.

All widgets in the gimp should handle extended input devices that send
"always core" correctly.  Currently, in things like the tool box, if I try
to use the stylus to enter the menus, then the gimp switches between "Core
Pointer" and "stylus" very very quickly, sometimes causeing quirky and
undeseriable behaviour.  Like jumping out of the menus, selecting things
below the menus, etc.

I believe it is the same problem that cause the gimp to go, spontainously,
from me dragging the continuous region selection threshold widget, to the
"detached dialog box" when dragging the slider widget.  This is very annoying!