Ticket #3173: fix location of popup windows upon screen resize.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
(dlg_set_size): clarify comment and hangling of DLG_TRYUP flag.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
Merge branch '3173_popup_location'

* 3173_popup_location:
  (dlg_set_size): clarify comment and hangling of DLG_TRYUP flag.
  Ticket #3173: fix location of popup windows upon screen resize.