Since the geniuses at terminal-wg are trying their best to create chaos
by retroactively changing the escape code used for this feature, it is
good to have a property for it in terminfo. Since tmux already uses Sync
for it, follow that in kitty's terminfo.
A couple of other terminals use it for styled underlines, in
contravention of the spec. But, in the interests of wider
interoperability add it to kitty as well.
Fixes#3725
The termcap aliases are not standard, but they are used by Vim, it
seems. As far as I can tell, there are no standard termcap attribute for
strikethrough.
In OSC/OTH mode, the parser accumulate bytes until it fills up or
encounters some end-of-osc sequence.
After entering in either of these mode by mistake, for example by
displaying random bytes (e.g. cat a binary) nothing would print anymore
but input would still work.
In that situation, being able to hit `reset` and recover a usable
terminal helps.
You can try with `echo -e '\xc2\x9e'` for PM
