emacs-29 5256392a7ec: Fix 'vertical-motion' when display strings are around

[Eli Zaretskii]

branch: emacs-29
commit 5256392a7ec0639ba4ba684d608bb3aaf976c985
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Fix 'vertical-motion' when display strings are around
    
    * src/indent.c (Fvertical_motion): Correct bidi-related condition
    for character position, when we didn't move vertically.  (Bug#61636)
---
 src/indent.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/indent.c b/src/indent.c
index 6de18d749ca..08d2bf5ea28 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -2401,7 +2401,7 @@ whether or not it is currently displayed in some window.  
*/)
             last line that it occupies.  */
          if (it_start < ZV)
            {
-             if ((it.bidi_it.scan_dir > 0)
+             if ((it.bidi_it.scan_dir >= 0 || it.vpos == vpos_init)
                  ? IT_CHARPOS (it) < it_start
                  : IT_CHARPOS (it) > it_start)
                {