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; * etc/TODO (display): Add entry about Default_Ignorables.

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Eli Zaretskii 2021-10-08 10:27:03 +03:00
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etc/TODO
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@ -444,6 +444,25 @@ consistency checks that make sure the new code computes the same results
as the old code. And once that works well, we can remove the old code
and old fields.
** Implement Unicode-compliant display of "default-ignorable" characters
See the "Characters Ignored for Display" section of paragraph 5.21 in
the Unicode Standard for the details.
The implementation would import the data from Unicode UCD file
DerivedCoreProperties.txt, and provide a minor mode that arranges for
the characters with the Default_Ignorable_Code_Point (DI) property to
be hidden on display. One way of implementing that could be via
glyphless-char-display-control; that one is global, but maybe there's
a way of making it buffer-local. Alternatively, this could be
implemented in C in the display engine.
An additional aspect of this is the display of U+00AD SOFT HYPHEN as
invisible except at line boundaries. Note that this would need to
support hard (physical) newlines in the buffer as well as soft
wrapping of long lines under 'visual-line-mode'. The algorithm for
selecting the wrap point may also need be changed to break at the soft
hyphen.
** FFI (foreign function interface)
See eg https://lists.gnu.org/r/emacs-devel/2013-10/msg00246.html