Use last event time when calling XSetInputFocus #101
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This fixes a race condition when WM_TAKE_FOCUS message is sent to
client windows, with the last event time as time parameter. The
client might react to the WM_TAKE_FOCUS message with a XSetInputFocus
call, and is expected to pass the message time as time parameter.
As fvwm concurrently calls XSetInputFocus with CurrentTime, it causes
a race condition and sometimes the X server gives focus to fvwm
window, stealing the focus from the client window.