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bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window wid
From: |
Eli Zaretskii |
Subject: |
bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again) |
Date: |
Fri, 15 Apr 2016 10:42:48 +0300 |
> Date: Fri, 15 Apr 2016 09:11:12 +0200
> From: Anders Lindgren <andlind@gmail.com>
> Cc: 22891@debbugs.gnu.org, martin rudalics <rudalics@gmx.at>
>
> R2L lines display the continuation glyph on the left.
>
> > In fact, I just tried this with the left fringe set to 0 with a
> bidirectional text stretching multiple lines, and
> the last
> > text column didn't appear to be used at all.
>
> Sorry, I don't understand what you tried. Please show a screenshot.
>
> I've attached a screenshot where I've:
You did that in *scratch*, which forces all lines to be L2R (because
its major mode is Emacs Lisp, a programming language mode). See the
value of bidi-paragraph-direction in that buffer. So all of your
lines are L2R, they just display text in R2L script.
To see what I meant, create a new buffer with "C-x b", then paste the
same text there, after setting the left fringe width to zero.
> Also, I noticed that `window-max-chars-per-line' does not take into account
> the variable `left-frame-width' (and
> presumably `right-frame-width').
You mean left-fringe-width, I presume? Yes, that's probably a bug.
> In the short term, I would like to see a function like
> `(continuation-glyph-visible-p WIN)' which could be used by
> functions like `window-max-chars-per-line' to get the logic correct without
> having to resort to replicate the
> details of the display engine (which, apparently, is non-trivial).
>
> In the long term, it would be great to have a `continuation-glyph-visible'
> frame property and corresponding
> buffer-local variable. That way a user could decide the layout for themselves.
Why is this useful, when we already have window-max-chars-per-line?
IOW, when would you like to know about the continuation glyph, and not
about how many characters can be displayed on a line?
- bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again), martin rudalics, 2016/04/11
- bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again), Anders Lindgren, 2016/04/14
- bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again), Eli Zaretskii, 2016/04/14
- bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again), Anders Lindgren, 2016/04/14
- bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again), Eli Zaretskii, 2016/04/14
- bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again), Anders Lindgren, 2016/04/15
- bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again),
Eli Zaretskii <=
- bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again), Anders Lindgren, 2016/04/15
- bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again), Eli Zaretskii, 2016/04/15