Previously, callbacks were called with a critical section held. It was
intended that monitor handles passed to callbacks should always be valid.
But it created a deadlock condition when callbacks call other functions
which try to grab the critical section using a different thread. Tests
also show that a monitor handle can be invalid after a display change.
So do not hold the critical section when calling callbacks. Monitor
handles will be checked when passed to GetMonitorInfo(), which is the
sole function that consumes HMONITORs.
Signed-off-by: Zhiyi Zhang <zzhang@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>