bug#43469: 28.0.50; window-text-pixel-size returns incorrect value when line-prefix is set

[Yuan Fu]

> On Sep 17, 2020, at 1:32 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Thu, 17 Sep 2020 12:03:35 -0400
>> 
>> (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?

Yuan