bug#44284: 27.1; with some Unicode font, scrolling upward with the mouse wheel actually scrolls downward when the cursor needs repositioning

[Vincent Lefevre <vincent@vinc17.net>]

On 2020-10-30 13:31:54 +0200, Eli Zaretskii wrote:
> Thanks.  This means that I will need a reproduction recipe with some
> less Unix-specific font, because I tried a lot of different font sizes
> and couldn't reproduce the problem, at least not in "emacs -Q".

Note that here the bug is reproducible with

  -misc-fixed-bold-r-normal--13-100-100-100-c-70-iso8859-1
  -misc-fixed-bold-r-normal--13-100-100-100-c-80-iso8859-1
  -misc-fixed-medium-r-normal--13-100-100-100-c-70-iso8859-1
  -misc-fixed-medium-r-normal--13-100-100-100-c-80-iso8859-1
  -misc-fixed-medium-r-normal--13-120-75-75-c-70-iso10646-1
  -misc-fixed-medium-r-normal--13-120-75-75-c-80-iso10646-1
  -misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1

but not with

  -misc-fixed-medium-r-normal--0-0-75-75-c-0-iso10646-1
  -misc-fixed-medium-r-normal--8-80-75-75-c-50-iso10646-1
  -misc-fixed-medium-r-normal--9-90-75-75-c-60-iso10646-1
  -misc-fixed-medium-r-normal--10-100-75-75-c-60-iso10646-1
  -misc-fixed-medium-r-normal--14-130-75-75-c-70-iso10646-1
  -misc-fixed-medium-r-normal--15-140-75-75-c-90-iso10646-1
  -misc-fixed-medium-r-semicondensed--0-0-75-75-c-0-iso10646-1
  -schumacher-clean-medium-r-normal--12-120-75-75-c-60-iso10646-1

So it seems to be the "13" that is the problem.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)