[vte/wip/egmont/bidi: 24/64] fix crash when scrolling back

[Egmont Koblinger <egmontkob src gnome org>]

commit 6362821a2ef194899f3f9ba15952344d4dbb753a
Author: Egmont Koblinger <egmont gmail com>
Date:   Thu Aug 23 00:53:53 2018 +0200

    fix crash when scrolling back

 src/vte.cc | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/src/vte.cc b/src/vte.cc
index c51ba4f0..52478c5d 100644
--- a/src/vte.cc
+++ b/src/vte.cc
@@ -8823,7 +8823,7 @@ Terminal::draw_rows(VteScreen *screen_,
 
         // FIXME find a nicer place for these
         m_ringview.set_ring (m_screen->row_data);
-        m_ringview.set_rows ((long) m_screen->scroll_delta, m_row_count + 2);
+        m_ringview.set_rows ((long) m_screen->scroll_delta, m_row_count + 3);
         m_ringview.set_width (m_column_count);
         m_ringview.update ();
 
@@ -9063,7 +9063,9 @@ Terminal::paint_cursor()
        width = m_cell_width;
        height = m_cell_height;
 
-        /* TODOegmont: clamp on rows? tricky... */
+        /* An outer rectangle might even peek in from a line that's completely scrolled out at the bottom. */
+        if (drow > last_displayed_row() + 1)
+                return;
        if (CLAMP(col, 0, m_column_count - 1) != col)
                return;
 
@@ -9072,7 +9074,7 @@ Terminal::paint_cursor()
 
         // FIXME find a nicer place for these
         m_ringview.set_ring (m_screen->row_data);
-        m_ringview.set_rows ((long) m_screen->scroll_delta, m_row_count + 2);
+        m_ringview.set_rows ((long) m_screen->scroll_delta, m_row_count + 3);
         m_ringview.set_width (m_column_count);
         m_ringview.update ();