bug#41633: Prompts incorrect for multi-occur and multi-isearch when using fido-mode

[Andrew Schwartzmeyer]

When fido-mode is enabled, you need to use M-j to end the selection, not RET. 
This is similar to ido-mode, which was already special-cased for multi-occur 
and multi-isearch-buffers.

The attached patch fixes these two instances, however I’ve discovered two more 
bugs while testing it. For one, M-j does NOT work in multi-isearch-files, and 
I’m not sure why. It’s supposed to work; it works for the other two. So I 
didn’t update the prompt in that function (which, by the way is not special 
cased for ido-mode,

For two, the check for ido-mode is actually broken, but I don’t yet know how to 
fix it. It does (eq read-buffer-function #'ido-read-buffer), but actually 
nowadays (maybe this was different in the past), ido-mode doesn’t set 
read-buffer-function, unless you call ido-everywhere, and then it still doesn’t 
set it but overrides it with an advice, so that its value is #f(advice-wrapper 
:override nil ido-read-buffer), and this fails the eq test.

Anyway, I’d suggest applying this patch for now, and then figuring out how to 
fix the check for ido.

Thanks,

Andy

0001-Fix-prompts-when-using-fido-mode.patch
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