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; Improve documentation of 'string-glyph-split'

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* doc/lispref/display.texi (Size of Displayed Text):
* lisp/emacs-lisp/subr-x.el (string-glyph-split): Document a
caveat (bug#79576).
This commit is contained in:
Eli Zaretskii 2025-10-05 11:04:34 +03:00
parent 0aa44112b6
commit cd400326b2
2 changed files with 8 additions and 1 deletions
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4
doc/lispref/display.texi
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@ -2459,6 +2459,10 @@ you can say:
@example
(apply #'insert (cdr (string-glyph-split string))))
@end example
Caveat: for this function to recognize and process character
compositions, @code{auto-composition-mode} must be enabled, and the
current buffer must be displayed in some window.
@end defun
When a buffer is displayed with line numbers (@pxref{Display Custom,,,

5
lisp/emacs-lisp/subr-x.el
View file

@ -365,7 +365,10 @@ substring that does not include newlines."
This takes into account combining characters and grapheme clusters:
if compositions are enabled, each sequence of characters composed
on display into a single grapheme cluster is treated as a single
indivisible unit."
indivisible unit.
Caveat: for this function to recognize characters compositions, the
automatic compositions should be enabled (see `auto-composition-mode')
and the current buffer must be displayed in some window."
(declare (side-effect-free t))
(let ((result nil)
(start 0)