iterm2: Makes histlist slow in iTerm (including quickfix)

[Xjs]

For some reason that I have not finally debugged, adding ftcs-command-start >/dev/tty to the prompt causes the histlist (bound by default to Ctrl-R) to render much slower than usual. (Usually comes up within a split second, on a full screen terminal takes 1-2 seconds to come up after iterm2:init has been called.) Occurs only in iTerm, calling iterm2:init in Terminal.app doesn't have this effect.

I fixed it by emitting iterm2:ftcs-command-finished before producing the history list, using the following stanza in rc.elv (after calling iterm2:init):

set edit:insert:binding[Ctrl-R] = {
	iterm2:ftcs-command-finished
	edit:histlist:start
}

I hope to spare somebody a few minutes of googling and debugging by this. If anybody more knowledgeable than me can explain to me a bit more thoroughly what's going on, I wouldn't mind :)