Obsolete smir/rmir sequences for ansi-generic?

[Rob King]

Hello,

    The description for the "ansi-generic" terminal type includes a 
reference to the "ansi+idc" building block, which in turn defines both 
smir and rmir to \E6. This is the "zTI/Toggle IRM" sequence.

    The only documentation I can find that references that sequence is 
for the Ambassador line of terminals (where it might be more accurately 
labeled as k{r,s}mir), and for the AIX High Function Terminal. The 1991 
edition of ECMA-48 doesn't define it, and while I don't have a copy of 
X3.64, it doesn't show up in any summaries of ANSI escape sequences that 
I can find. xterm defines it as Back Index (DECBI).

    Since the "ansi+idc" entry is designed to be used as a building 
block for other "ANSI-like" terminal definitions, I would recommend 
replacing those sequences with "\E[4h" and "\E[4l", since those seem to 
be universally supported. This greatly increases (IMHO) that entry's 
usefulness as a building block. The SRM-style sequences also have the 
benefit of being idempotent.

    Someone please correct me if I'm wrong.

    Thanks,

    Rob