bug#45837: 28.0.50; incorrect cursor position in visual-line-mode when word-wrap-by-category is t

[Liu Hui]

Eli Zaretskii <eliz@gnu.org> 于2021年1月19日周二 上午1:14写道：
>
> However, posn-at-point also returns the coordinates in (COLUMN . ROW)
> units, and we can use that instead.  So I propose to fix the current
> code on master as below.  WDYT?

I think it's a better fix. Thanks!