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bug#35898: 26.1; line-beginning-position sometimes does not yield line b
From: |
Eli Zaretskii |
Subject: |
bug#35898: 26.1; line-beginning-position sometimes does not yield line beginning position |
Date: |
Sat, 25 May 2019 17:01:01 +0300 |
> From: Markus Triska <triska@metalevel.at>
> Date: Sat, 25 May 2019 15:23:48 +0200
>
> $ wget https://www.metalevel.at/ei/hello.png
>
> and then, starting Emacs with "emacs -Q", evaluate the following form:
>
> (progn
> (goto-char (point-min))
> (save-excursion (insert "\n"))
> (goto-char (+ (point) (cadr (insert-image-file "hello.png"))))
> (line-beginning-position))
>
> This yields 592, whereas I expect it to yield 1.
Your expectations are unjustified, because line-beginning-position is
not supposed to work on visual lines, it works on logical/physical
lines, i.e. it scans the buffer for newline characters.
For visual-line operation, you can use either beginning-of-visual-line
or vertical-motion (the former actually calls the latter internally).
> Is there a way to make line-beginning-position yield the line beginning
> position in cases like this? Would you please consider adding this feature?
We already have features to query about the visual lines, so I don't
see why we would need line-beginning-position work in terms of visual
lines. It will fail Lisp programs that want to disregard the visual
appearance of the buffer.