bug#67220: 30.0.50; ERC 5.6: Prefer parameter-driven MODE processing in ERC

[J.P.]

"J.P." <jp@neverwas.me> writes:

>> I think it's worth correcting this in ERC 5.6. Proposed changes
>> attached. (The first patch is unrelated.)
>
> These changes now live on master as
>
>   3d87e343276 * Use modern fallback for channel name detection in ERC
>   25d15391f26 * Normalize ISUPPORT params with empty values in ERC
>
> If anyone experiences new difficulties related to detecting channel
> names, these are likely to blame.

A regression involving `erc-query-buffer-p' has surfaced that basically
makes the function unsuable in many situations. The root cause is some
combination of stupdiity and laziness on my part, as usual. The attached
patch should fix the issue. Thanks to Libera user mekeor for reporting
this.

0001-Fix-regression-involving-erc-query-buffer-p.patch
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