Update IT's metrics while simulating display

* src/xdisp.c (maybe_produce_line_number): Update IT's metrics
also when glyph_row is NULL.  This is important for move_it_*
functions.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index aa75fcaf77c..3283f9ee971 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -20925,6 +20925,13 @@ maybe_produce_line_number (struct it *it)
       it->max_phys_descent = max (row->phys_height - row->phys_ascent,
                                   tem_it.max_phys_descent);
     }
+  else
+    {
+      it->max_ascent = max (it->max_ascent, tem_it.max_ascent);
+      it->max_descent = max (it->max_descent, tem_it.max_descent);
+      it->max_phys_ascent = max (it->max_phys_ascent, tem_it.max_phys_ascent);
+      it->max_phys_descent = max (it->max_phys_descent, tem_it.max_phys_descent);
+    }
 
   bidi_unshelve_cache (itdata, false);
 }