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Mention 'glyphless-display-mode' in conjunction with bidi display

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* doc/emacs/mule.texi (Bidirectional Editing): Mention
'glyphless-display-mode'.  (Bug#27544)
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Eli Zaretskii 2021-12-01 20:11:21 +02:00
parent d086d4f91d
commit e2e2dd4890
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doc/emacs/mule.texi
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@ -1992,3 +1992,16 @@ or right of the current screen position, moving to the next or
previous screen line as appropriate. Note that this might potentially
move point many buffer positions away, depending on the surrounding
bidirectional context.
@cindex bidi formatting control characters
Bidirectional text sometimes uses special formatting characters to
affect the reordering of text for display. The @sc{lrm} and @sc{rlm}
characters, mentioned above, are two such characters, but there are
more of them. They are by default displayed as thin space glyphs on
GUI frames, and as simple spaces on text-mode frames. If you want to
be aware of these special control characters, so that their effect on
display does not come as a surprise, you can turn on the
@code{glyphless-display-mode} (@pxref{Text Display}). This minor mode
will cause these formatting characters to be displayed as acronyms
inside a small box, so that they stand out on display, and make their
effect easier to understand.