It seems (confirm this if you can Jez) that the "issues" probably only
occur for SB_THUMBPOSITION and SB_THUMBTRACK operations, as these are
the only that use the position value which is potentially from the
WM_HSCROLL or WM_VSCROLL message.
To allow easier "plumbing", and for the sake of efficiency, I'm adding a
special value to the "position" parameter, of -1, which means "use the
value from GetScrollInfo nTrackPos instead of the passed in value. So
user code that directly calls Scroll($hv,SB_THUMBPOSITION,$pos)
without receiving a message will still work, but user code that says
I've just tested this and works great in practise. Nice.
Cheers,
jez.
