(Tested with 2012-08-01 and 2012-11-21 version.)
Following is my ~/.kshrc:
### kshrc begin ###
compound -r g=( typeset -F3 ed_seconds=0)
function _keybd_jj
{
if (( .sh.edcol == 0 )); then
(( g.ed_seconds = SECONDS ))
return
fi
if [[ ${.sh.edchar} == j && ${.sh.edmode} == $'\e' ]]; then
if [[ ${.sh.edtext:.sh.edcol - 1:1} == j ]] \
&& (( SECONDS - g.ed_seconds > .1 && SECONDS - g.ed_seconds < 1
))
then
.sh.edchar=$'\b\e'
else
(( g.ed_seconds = SECONDS ))
fi
fi
}
trap _keybd_jj KEYBD
PS1='$ '
### kshrc end ###
Now, start ksh and ...
$ ksh
$ sleep 60
^C$ sleep 60
^C$ s
$ l
$ e
$ e
$ p
$
After the sleep command was killed twice by ctrl-c, the command line became
crazy and I could not input another sleep command.
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