bug#31692: Emacs sometimes drops key events

[Michael Heerdegen]

Eli Zaretskii <eliz@gnu.org> writes:

> I don't think you can reliably rebind C-g.  For starters, it produces
> SIGINT on TTY frames, so I think rebinding will have no effect, at
> least in that use case.

I think you misunderstood.  My fix was not to rebind C-g.

With our fix, hitting C-g while `sit-for' waits inside a
`while-no-input' makes the latter throw a 'quit' signal.  I can use
`condition-case' to catch that quit, and call the actual binding of C-g
(or just a hardcoded `abort-recursive-edit').

> Anyway, can you show some Lisp to reproduce the issue?

Here is a template.  To try it, call `read-test-input'.  To see that C-g
is not always running as expected, hit C-g while a sit-for is running
(i.g. when the hint is shown).

`read-test-input' reads in input and tries to do something: in this
example counts words in the current buffer (which is interruptable) and
uses an overlay to show a message in the minibuffer, which is
automatically removed after a `sit-for' has finished.

testcase.el
Description: application/emacs-lisp

Michael.