Development item: NumLock

["Harold Hunt" <huntharo at msu dot edu>]

For anyone looking for something to do:

Take a look at how we are messing up the handling of NumLock.  For a simple
test case, install the lesstif package via Cygwin's setup.exe, run mwm.exe
as your window manager, make sure NumLock is on, then try to move a MWM
managed window.  The window won't budge.  Turn NumLock off and the window
can move freely.

It may be incorrect to treat NumLock as a 'modifier key', see
xc/programs/Xserver/hw/xwin/winkeybd.c/winGetKeyMappings (), but not
treating NumLock as a modifier key causes the NumLock key to have no effect
on whether the numerical keypad gives you numbers (NumLock on behavior) or
arrows (NumLock off behavior).  I think that both states of NumLock give you
arrows in that case.

For clues you can take a look at other servers, such as XDarwin over in
xc/programs/Xserver/hw/darwin/darwinKeyboard.c.  Notice that they use
modifier masks LockMask (CapsLock), ShiftMask, ControlMask, AltMask,
MetaMask and FunctionMask.  But they don't use NumLockMask.

What gives?  Is NumLock a modifier key or not?  If not, why doesn't it do
anything in Cygwin/XFree86 when we don't treat it as a modifier?

Hopefully that provides enough food for thought.

Good luck,

Harold