bug#79241: Fix incorrect handling of overlays in `vertical-motion'

* src/indent.c (vertical-motion): If iterator is inside an overlay,
reset it to the beginning of line before trying to reach goal
column.  This prevents point from being stuck at the beginning
of overlay strings during upward motions.

Copyright-paperwork-exempt: yes

1 files changed, 3 insertions, 0 deletions

diff --git a/src/indent.c b/src/indent.c
index b4f3c349dc5..95228b26825 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -2506,6 +2506,9 @@ buffer, whether or not it is currently displayed in some window.  */)
          an addition to the hscroll amount.  */
       if (!NILP (lcols))
         {
+          if (it.method == GET_FROM_STRING && !NILP (it.from_overlay))
+            reseat_at_previous_visible_line_start(&it);
+
           move_it_in_display_line (&it, ZV, first_x + to_x, MOVE_TO_X);
           /* If we find ourselves in the middle of an overlay string
              which includes a newline after current string position,