[vte] widget: Fix invalidation with scrolling region

[Egmont Koblinger <egmontkob src gnome org>]

commit 9c657532e6c7871266dbf70b6488a749ac22fc14
Author: Egmont Koblinger <egmont gmail com>
Date:   Fri May 31 10:30:52 2019 +0200

    widget: Fix invalidation with scrolling region
    
    In some special case involving a scrolling region, the wrong part
    of the display was invalidated.
    
    https://gitlab.gnome.org/GNOME/vte/issues/131

 src/vte.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/vte.cc b/src/vte.cc
index cd9a565e..920ab7e9 100644
--- a/src/vte.cc
+++ b/src/vte.cc
@@ -2694,7 +2694,8 @@ Terminal::cursor_down(bool explicit_sequence)
                                 ring_insert(m_screen->cursor.row, false);
                                /* Force the areas below the region to be
                                 * redrawn -- they've moved. */
-                                invalidate_rows(start, end);
+                                invalidate_rows(m_screen->cursor.row,
+                                                m_screen->insert_delta + m_row_count - 1);
                                /* Force scroll. */
                                adjust_adjustments();
                        } else {