K 10
svn:author
V 8
dumbbell
K 8
svn:date
V 27
2014-08-21T15:55:18.325167Z
K 7
svn:log
V 462
vt(4): Pause the flush timer while swithing window

This fixes bad looking refresh when switching window: squares instead
of text, flashing screen, and so on. In the worst case, vt_flush() came
at a very inappropriate timing and the screen was not refreshed at all
(leaving squares all over the place).

This doesn't fix the flickering of the screen with vt_vga, because the
sync signal is temporarily stopped and the video memory is cleared.

MFC after:	1 week

END