28 mars 2022 kl. 14.08 skrev J.P. <jp@neverwas.me>:

> As you highlighted up thread, inhibited sends appeal to
> `wait_reading_process_output' to try and shake something loose. I agree
> such occasions seem likeliest to trigger "unexpected" filter nesting.

Although it seems reasonable to require that filter functions abstain from sending more data to the process, there may be another way: preventing re-entering process-send calls from recursing further.

Attached is a proof of concept: if process-send calls are invoked when another activation already exists, just enqueue the data and let the previous activation deal with the actual transmission. That nips the recursion in the buds.

The principle seems sound but if anyone can think of problems with the approach, please do tell.

Of course, one reason to make the change in ERC is that it would fix the problem in all Emacs versions, not just 29.