Bug#1052198: libvte-2.91-0: swallowed characters on libreadline editing

[Egmont Koblinger]

Hi Chris,

> Interestingly, I've just been able to reproduce it even with 0.73.99-1:

This makes sense. I was wondering how a patch that supposedly only
touches a11y (how the contents are read out loud) could have an effect
on the actual emulation behavior.

Can you try under xterm or other non-VTE-based terminals? I suspect
you'll see the same behavior there.

It could be a bash issue, or a misconfigured prompt.

In fact, I _think_ the culprit is that inside command substitution
stuff, a.k.a.. $(...), nonprintable characters need to be enclosed
within the raw bytes 0x01 and 0x02, rather than the two-character
sequences \[ and \]. Not entirely sure, though.

If you can't locate the problem, and if it's specific to VTE, then you
should record the traffic using `script` and it should be manually,
step-by-step verified what the terminal does for that, e.g. compared
against xterm to see where it goes different. But I'm almost entirely
certain that it'll be a bash issue rather than a VTE one.

Nevertheless, the crash you encountered might be the same caused by
the currently debated a11y patch.

e.