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Avoid breaking Arabic shaping in 'window-text-pixel-size'

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* src/xdisp.c (CHAR_COMPOSED_P): If the bidi_p flag is not set,
pass -1 to composition_reseat_it, so that the shaping engine will
figure out the directionality of the text.  This is important,
e.g., when using move_it_* functions in some context that is not
redisplay, such as 'window-text-pixel-size'.  (Bug#44521)
This commit is contained in:
Eli Zaretskii 2020-11-09 17:22:25 +02:00
parent e693d97e50
commit 13ab70c80e
1 changed files with 9 additions and 2 deletions
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11
src/xdisp.c
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@ -7221,14 +7221,21 @@ static next_element_function const get_next_element[NUM_IT_METHODS] =
/* Return true iff a character at CHARPOS (and BYTEPOS) is composed
(possibly with the following characters). */
(possibly with the following characters).
Note: we pass -1 as the "resolved bidi level" when the iterator
doesn't have the bidi_p flag set, because in that case we really
don't know what is the directionality of the text, so we leave it to
the shaping engine to figure that out. */
#define CHAR_COMPOSED_P(IT,CHARPOS,BYTEPOS,END_CHARPOS) \
((IT)->cmp_it.id >= 0 \
|| ((IT)->cmp_it.stop_pos == (CHARPOS) \
&& composition_reseat_it (&(IT)->cmp_it, CHARPOS, BYTEPOS, \
END_CHARPOS, (IT)->w, \
(IT)->bidi_it.resolved_level, \
(IT)->bidi_p \
? (IT)->bidi_it.resolved_level \
: -1, \
FACE_FROM_ID_OR_NULL ((IT)->f, \
(IT)->face_id), \
(IT)->string)))