patch 9.2.0080: popup: a few redrawing problems

patch 9.2.0080: popup: a few redrawing problems

Problem:   Popup windows leave ghost images when moved. Visual options
           do not trigger a redraw when updated via popup_setoptions().
           An empty borderhighlight list fails to clear existing
           highlights.
Solution:  Modify f_popup_move() in src/popupwin.c to save the old
           position before moving and force a redraw. Enhance
           f_popup_setoptions() to trigger a redraw when
           visual-affecting options change. Modify
           apply_general_options() to explicitly clear border
           highlights when an empty list is provided
           (Yasuhiro Matsumoto).

closes: #19297

Signed-off-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>