In -multiwindow mode, tell Windows we wish to capture the mouse when a button
is down. This causes Windows to continue to send movement events for the mouse
even if the mouse pointer moves outside the window frame.
This helps greatly with undecorated windows which have regions you can grab
to move (e.g. gmplayer, xine control panels) or resize (e.g. Songbird) the
window, as it means the window continues to receive the mouse motion even if the
mouse pointer moves out of the window (which presumably happens if we don't
manage to update the window fast enough to track the mouse pointer)
Consolidate the multiple instances of the code to start the mouse position
polling timer into a new function winStartMousePolling(), and use that to
restart the polling timer when we release the mouse.
Also, start the timer on WM_SHOW, so that xeyes will track the mouse position
when it is first shown, even if the mouse doesn't enter it's window
(You probably need focus-stealing turned off to see this problem)
Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
85614946ba