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; Improve documentation of 'line-prefix' and 'wrap-prefix'.

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* doc/lispref/text.texi (Special Properties): Spell out more
accurately how 'line-prefix' and 'wrap-prefix' properties should
be set.
This commit is contained in:
Eli Zaretskii 2024-07-26 14:56:14 +03:00
parent 268a2d10fc
commit 87389f9ff9
1 changed files with 25 additions and 13 deletions
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doc/lispref/text.texi
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@ -3854,13 +3854,19 @@ controls the total height of the display line ending in that newline.
@xref{Line Height}.
@item wrap-prefix
If text has a @code{wrap-prefix} property, the prefix it defines will
be added at display time to the beginning of every continuation line
due to text wrapping (so if lines are truncated, the wrap-prefix is
never used). It may be a string or an image (@pxref{Other Display
Specs}), or a stretch of whitespace such as specified by the
@code{:width} or @code{:align-to} display properties (@pxref{Specified
Space}).
If a region of text has a @code{wrap-prefix} property, the prefix it
defines will be added at display time to the beginning of every
continuation line due to text wrapping (so if lines are truncated, the
wrap-prefix is never used). The property value may be a string or an
image (@pxref{Other Display Specs}), or a stretch of whitespace such as
specified by the @code{:width} or @code{:align-to} display properties
(@pxref{Specified Space}). Note that to have its effect, the
@code{wrap-prefix} property must be set on the entire region of text,
starting from the first character of the first line of that text and up
to the last character of the last line; otherwise, breaking the text
into lines in a different way might fail to display the prefix, because
the display engine checks for this property only immediately after
continuing a line.
A wrap-prefix may also be specified for an entire buffer using the
@code{wrap-prefix} buffer-local variable (however, a
@ -3868,12 +3874,18 @@ A wrap-prefix may also be specified for an entire buffer using the
the @code{wrap-prefix} variable). @xref{Truncation}.
@item line-prefix
If text has a @code{line-prefix} property, the prefix it defines will
be added at display time to the beginning of every non-continuation
line. It may be a string or an image (@pxref{Other Display
Specs}), or a stretch of whitespace such as specified by the
@code{:width} or @code{:align-to} display properties (@pxref{Specified
Space}).
If a region of text has a @code{line-prefix} property, the prefix it
defines will be added at display time to the beginning of every
non-continuation line. The property value may be a string or an image
(@pxref{Other Display Specs}), or a stretch of whitespace such as
specified by the @code{:width} or @code{:align-to} display properties
(@pxref{Specified Space}). Note that to have its effect, the
@code{line-prefix} property must be set on the entire region of text,
starting from the first character of the first line of that text and up
to the last character of the last line; otherwise, breaking the text
into lines in a different way might fail to display the prefix, because
the display engine checks for this property only when starting a new
line.
A line-prefix may also be specified for an entire buffer using the
@code{line-prefix} buffer-local variable (however, a