bug#20589: 25.0.50; Lack of imenu-flush-cache function

[Lars Ingebrigtsen]

Marcin Borkowski <mbork@mbork.pl> writes:

> As mentioned by Stefan Monnier in this Emacs.SE answer:
> http://stackoverflow.com/a/13447080/1181665, there seems to be a need
> for a imenu-flush-cache function.  IIUC from that answer:
>
> ,----
> | Indeed, there's no imenu-rescan function. Looking at the general way
> | the code works, I think it makes sense there's no such function, but
> | there should be a imenu-flush-cache function, which is missing. Please
> | M-x report-emacs-bug requesting such a new feature. In the mean time,
> | you can (setq imenu--index-alist nil) to flush the cache by hand.
> `----
>
> it should just call (setq imenu--index-alist nil).

I've now added this to Emacs 29.

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