master d6e08ff459: Fix rare problems with current-column when text is invisible

[Eli Zaretskii]

branch: master
commit d6e08ff459df4cda9eda0c5c842313d02851ba3d
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Fix rare problems with current-column when text is invisible
    
    * src/indent.c (scan_for_column, compute_motion): Don't miss
    compositions when the position to check for composition happens to
    be inside invisible text.  (Bug#58791)
---
 src/indent.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/indent.c b/src/indent.c
index aa905f387b..4bf597a339 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -637,6 +637,11 @@ scan_for_column (ptrdiff_t *endpos, EMACS_INT *goalcol,
            scan_byte = CHAR_TO_BYTE (scan);
          if (scan >= end)
            goto endloop;
+         /* We may have over-stepped cmp_it.stop_pos while skipping
+            the invisible text.  If so, update cmp_it.stop_pos.  */
+         if (scan > cmp_it.stop_pos && cmp_it.id < 0)
+           composition_reseat_it (&cmp_it, scan, scan_byte, end,
+                                  w, -1, NULL, Qnil);
        }
 
       /* Test reaching the goal column.  We do this after skipping
@@ -1358,6 +1363,9 @@ compute_motion (ptrdiff_t from, ptrdiff_t frombyte, 
EMACS_INT fromvpos,
              pos = newpos;
              pos_byte = CHAR_TO_BYTE (pos);
            }
+         if (newpos > cmp_it.stop_pos && cmp_it.id < 0)
+           composition_reseat_it (&cmp_it, pos, pos_byte, to,
+                                  win, -1, NULL, Qnil);
 
          rarely_quit (++quit_count);
        }