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bug#43469: 28.0.50; window-text-pixel-size returns incorrect value when
From: |
Eli Zaretskii |
Subject: |
bug#43469: 28.0.50; window-text-pixel-size returns incorrect value when line-prefix is set |
Date: |
Fri, 18 Sep 2020 22:22:17 +0300 |
> From: Yuan Fu <casouri@gmail.com>
> Date: Fri, 18 Sep 2020 13:05:15 -0400
> Cc: 43469@debbugs.gnu.org
>
> >> (progn (insert "xxxxxxxxxxxxxx")
> >> (print (car (window-text-pixel-size
> >> nil (line-beginning-position) (line-end-position))))
> >> (put-text-property (line-beginning-position) (line-end-position)
> >> 'line-prefix " ")
> >> (print (car (window-text-pixel-size
> >> nil (line-beginning-position) (line-end-position)))))
> >>
> >> Prints first 98, then 119
> >
> > Why do you think this is a bug?
>
> I thought the pixel width shouldn’t include the line-prefix?
It should. From the function's doc string:
This function exists to allow Lisp programs to adjust the dimensions
of WINDOW to the buffer text it needs to display.
When you want to know how wide a window you need for displaying some
text, you do want the line-prefix part accounted for.
bug#43469: Fwd: bug#43469: 28.0.50; window-text-pixel-size returns incorrect value when line-prefix is set, Yuan Fu, 2020/09/19