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Explain effect of variable-pitch fonts on fill-column

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* doc/emacs/text.texi (Fill Commands):
* doc/emacs/display.texi (Displaying Boundaries):
* lisp/display-fill-column-indicator.el
(display-fill-column-indicator-mode): Document caveats of using
variable-pitch fonts with 'fill-column' and its indicator.
(Bug#61677)
This commit is contained in:
Eli Zaretskii 2023-02-22 15:16:25 +02:00
parent ba91a76659
commit 003759a6dc
3 changed files with 14 additions and 2 deletions
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6
doc/emacs/display.texi
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@ -1402,7 +1402,11 @@ right-to-left paragraphs.
functionality especially in @code{prog-mode} and its descendants functionality especially in @code{prog-mode} and its descendants
(@pxref{Major Modes}) to indicate the position of a specific column (@pxref{Major Modes}) to indicate the position of a specific column
that has some special meaning for formatting the source code of a that has some special meaning for formatting the source code of a
program. program. This assumes the buffer uses a fixed-pitch font, where all
the characters (with the possible exception of double-width
characters) have the same width on display. If the buffer uses
variable-pitch fonts, the fill-column indicators on different lines
might appear unaligned.
To activate the fill-column indication display, use the minor modes To activate the fill-column indication display, use the minor modes
@code{display-fill-@-column-indicator-mode} and @code{display-fill-@-column-indicator-mode} and

7
doc/emacs/text.texi
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@ -619,7 +619,12 @@ variable @code{fill-column}. The default value (@pxref{Locals}) is
is to use the command @kbd{C-x f} (@code{set-fill-column}). With a is to use the command @kbd{C-x f} (@code{set-fill-column}). With a
numeric argument, it uses that as the new fill column. With just numeric argument, it uses that as the new fill column. With just
@kbd{C-u} as argument, it sets @code{fill-column} to the current @kbd{C-u} as argument, it sets @code{fill-column} to the current
horizontal position of point. horizontal position of point. Note that, by its very nature,
@code{fill-column} is measured in column units; the actual position of
that column on a graphical display depends on the font being used. In
particular, using variable-pitch fonts will cause the
@code{fill-column} occupy different horizontal positions on display in
different lines.
@cindex centering @cindex centering
@findex center-line @findex center-line

3
lisp/display-fill-column-indicator.el
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@ -53,6 +53,9 @@ customize `display-fill-column-indicator-column'. You can change the
character for the indicator setting `display-fill-column-indicator-character'. character for the indicator setting `display-fill-column-indicator-character'.
The globalized version is `global-display-fill-column-indicator-mode', The globalized version is `global-display-fill-column-indicator-mode',
which see. which see.
This minor mode assumes the buffer uses a fixed-pitch font; if you
use variable-pitch fonts, the indicators on different lines might
not appear aligned.
See Info node `Displaying Boundaries' for details." See Info node `Displaying Boundaries' for details."
:lighter nil :lighter nil
(if display-fill-column-indicator-mode (if display-fill-column-indicator-mode