bug#62355: 30.0.50; C-g doesn't always quit minibuffer on first press

[Stefan Monnier]

> For a while I've been having trouble C-g isn't quitting the minibuffer
> after the first press.

The issue may reflect a real bug, but maybe not: `C-g` will exit the
minibuffer if Emacs is sitting idle in the minibuffer but it will
interrupt what's currently running if Emacs is not currently idle.

Sometimes this "idleness" is not obvious (it can be some timer code or
something running asynchronously).

Maybe we should tweak the behavior of `while-no-input` (or provide a new
macro for that) so that a `C-g` hit during its execution causes both the
interruption of what was going on *and* the execution of the command
bound to `C-g`?


        Stefan