The caret needs to be moved along with scrolling even if it's
outside the visible area. Otherwise, when the caret is scrolled
out from the view, the position won't get updated anymore and
the caret will never scroll back again.

The idea is based on the patch by André Hentschel.
Signed-off-by: Lauri Kenttä <lauri.kentta@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>