[TERMINFO BUG?] VT100 reset string ignores scrolling margins and VT52 mode

[Rob King]

Hello,
    The class "vt100|vt100-am" terminfo entry has as its rs2 sequence 
"rs2=\E>\E[?3l\E[?4l\E[?5l\E[?7h\E[?8h". This resets all of the various 
DEC private modes to their default values. This is the only reset string 
currently defined for the VT100.

    This sequence does not appear to reset scrolling margins. As the 
top and bottom margins are settable via escape sequences, it is possible 
to get the terminal in a state where scrolling is invalid and not 
fixable via the reset utility.

    The reset string likewise does not exit out of VT52 emulation mode, 
which is also something that is settable via software and therefore a 
place where a user could get "stuck" and beyond the reach of "reset".

    I would recommend, if possible, updating the reset string to 
something like "\E<\Ec", which would exit VT52 emulation mode (if the 
terminal is in such a state) and then use the RIS (Reset to Initial 
State) sequence to completely reset the terminal state.

    If this is not desirable due to the side-effects of the RIS 
sequence (which causes the POST to execute), perhaps the existing reset 
string could be modified to include "\E<\E[r", to get the terminal in 
ANSI mode and reset its scrolling margins. The "\E<" would need to be 
the first component of the reset string, since the following components 
would not be recognized in VT52 mode.

    Thank you.