(window_scroll_pixel_based): Force moving to next line

if scrolling doesn't move start point, e.g. if looking at tall image.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/window.c b/src/window.c
index 85376dd7b50..ef3d38c1554 100644
--- a/src/window.c
+++ b/src/window.c
@@ -4628,8 +4628,16 @@ window_scroll_pixel_based (window, n, whole, noerror)
       if (dy <= 0)
         move_it_vertically_backward (&it, -dy);
       else if (dy > 0)
-        move_it_to (&it, ZV, -1, it.current_y + dy, -1,
-                    MOVE_TO_POS | MOVE_TO_Y);
+        {
+          int start_pos = IT_CHARPOS (it);
+          move_it_to (&it, ZV, -1, it.current_y + dy, -1,
+                      MOVE_TO_POS | MOVE_TO_Y);
+          /* Ensure we actually does move, e.g. in case we are currently
+             looking at an image that is taller that the window height.  */
+          while (start_pos == IT_CHARPOS (it)
+                 && start_pos < ZV)
+            move_it_by_lines (&it, 1, 1);
+        }
     }
   else
     move_it_by_lines (&it, n, 1);