[vte] emulation: Maintain cursor column during screen switch

[Egmont Koblinger <egmontkob src gnome org>]

commit af2c8bad34a17fcf7c59e2a292fe3ae93c211369
Author: Egmont Koblinger <egmont gmail com>
Date:   Thu Nov 14 12:15:35 2019 +0100

    emulation: Maintain cursor column during screen switch
    
    https://gitlab.gnome.org/GNOME/vte/issues/198

 src/vteseq.cc | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/vteseq.cc b/src/vteseq.cc
index ea11444f..f07b4de7 100644
--- a/src/vteseq.cc
+++ b/src/vteseq.cc
@@ -445,8 +445,10 @@ Terminal::switch_screen(VteScreen *new_screen)
 
         /* cursor.row includes insert_delta, adjust accordingly */
         auto cr = m_screen->cursor.row - m_screen->insert_delta;
+        auto cc = m_screen->cursor.col;
         m_screen = new_screen;
         m_screen->cursor.row = cr + m_screen->insert_delta;
+        m_screen->cursor.col = cc;
 
         /* Make sure the ring is large enough */
         ensure_row();