Fix vertical cursor motion across overlay strings

* src/indent.c (Fvertical_motion): Fix vertical cursor motion when
a screen line begins with an overlay string.  (Bug#80223)

1 files changed, 4 insertions, 1 deletions

diff --git a/src/indent.c b/src/indent.c
index 427350020fd..3443ddb8c73 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -2506,7 +2506,10 @@ 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))
+          /* Start at beginning of line if inside an overlay string, to
+             avoid becoming stuck at the beginning of the overlay string.  */
+          if (it.continuation_lines_width <= 0 /* not in continuation line */
+              && 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);