(move_it_to): When moving by vpos, ensure that the iterator advances

to the next line if the current line ends in a continued tab.

1 files changed, 12 insertions, 2 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index 82c9e82effa..a6d1a82eb33 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -7216,8 +7216,18 @@ move_it_to (it, to_charpos, to_x, to_y, to_vpos, op)
              associated with the tab are displayed on the current
              line.  Since it->current_x does not include these glyphs,
              we use it->last_visible_x instead.  */
-          it->continuation_lines_width +=
-            (it->c == '\t') ? it->last_visible_x : it->current_x;
+          if (it->c == '\t')
+            {
+              it->continuation_lines_width += it->last_visible_x;
+              /* When moving by vpos, ensure that the iterator really
+                 advances to the next line (bug#847).  Fixme: do we
+                 need to do this in other circumstances?  */
+              if ((op & MOVE_TO_VPOS)
+                  && !(op & (MOVE_TO_X | MOVE_TO_POS)))
+                set_iterator_to_next (it, 0);
+            }
+          else
+            it->continuation_lines_width += it->current_x;
           break;
 
         default: