emacs-28 00eb21c: ; * src/dispextern.h (struct glyph_string): Comment on NCHARS. (Bug#51105)

[Eli Zaretskii]

branch: emacs-28
commit 00eb21c8979f4e53345fdc021d32307d102afda9
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    ; * src/dispextern.h (struct glyph_string): Comment on NCHARS.  (Bug#51105)
---
 src/dispextern.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/dispextern.h b/src/dispextern.h
index 6aefe43..08dac5d 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -1326,7 +1326,9 @@ struct glyph_string
   /* The area within row.  */
   enum glyph_row_area area;
 
-  /* Characters to be drawn, and number of characters.  */
+  /* Characters to be drawn, and number of characters.  Note that
+     NCHARS can be zero if this is a composition glyph string, as
+     evidenced by FIRST_GLYPH->type.  */
   unsigned *char2b;
   int nchars;