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)

1 files changed, 8 insertions, 0 deletions

diff --git a/src/indent.c b/src/indent.c
index aa905f387bb..4bf597a339f 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);
         }