Begin forwarded message:
Subject: Re: bug#43469: 28.0.50; window-text-pixel-size returns incorrect value when line-prefix is set
Date: September 19, 2020 at 2:33:03 PM GMT-4
On Sep 18, 2020, at 3:22 PM, Eli Zaretskii <eliz@gnu.org> wrote:
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.
I see. I managed to use (window-text-pixel-size nil (point) (point)) to calculate the prefix width and subtract it out. Thanks. Yuan
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