Do not send "\e[21m" when turning off bold. It enables underline!

Specifically, in ECMA-48, ESC [ 21 m means to turn on double
underline.  The result is that much output is underlined.

According to
   https://bjh21.me.uk/all-escapes/all-escapes.txt
this sequence is or was used by `linux' to turn off bold.  But
sympathy also sends ESC [ 22 m.  Tests with Linux 3.16.43-2+deb8u3
show that a Linux console reacts to ESC [ 22 m by turning off bold,
and that ESC [ 21 m is not needed.

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/src/ansi.c b/src/ansi.c
index 91a80b6..1c7fe57 100644
--- a/src/ansi.c
+++ b/src/ansi.c
@@ -370,8 +370,6 @@ ansi_set_attr (ANSI * a, int attr)
       if (a->terminal->xmit (a->terminal, "\033[1m", 4) != 4)
         err++;
     } else {
-      if (a->terminal->xmit (a->terminal, "\033[21m", 5) != 5)
-        err++;
       if (a->terminal->xmit (a->terminal, "\033[22m", 5) != 5)
         err++;
     }