PuTTY semi-bug sgr21

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summary: PuTTY's interpretation of SGR 21 differs from Linux's
class: semi-bug: This might or might not be a bug, depending on your precise definition of what a bug is.
difficulty: fun: Just needs tuits, and not many of them.
priority: low: We aren't sure whether to fix this or not.

ECMA-48 defines SGR 21 as enabling double-underline.  PuTTY interprets this
the same as single-underline (SGR 4).  SCOANSI and Linux interpret it as
turning off bold, and at least some applications seem to rely on this.
VT520 and xterm don't support this sequence at all.  Perhaps PuTTY should
align its behaviour with one of the others.  xterm would be more ideologically
pure, but SCOANSI might be more generally useful.

Audit trail for this semi-bug.

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(last revision of this bug record was at 2004-11-16 15:27:00 +0000)