The alternate screen support added by commit 23743ba647 ("vt: add
support for smput/rmput escape codes") only saves and restores the
regular screen buffer (vc_origin), but completely ignores the corresponding
unicode screen buffer (vc_uni_lines) creating a messed-up display.
Add vc_saved_uni_lines to save the unicode screen buffer when entering
the alternate screen, and restore it when leaving. Also ensure proper
cleanup in reset_terminal() and vc_deallocate().
Fixes: 23743ba647 ("vt: add support for smput/rmput escape codes")
Cc: stable <[email protected]>
Signed-off-by: Nicolas Pitre <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Nicolas Pitre
5eb608319b