bug#60428: 29.0.60; ERC 5.4.1: Fix default-port regression in erc-select-read-args

[J.P.]

v2. Respect `erc-prompt-for-password'. Remove `run-at-time' hack from
regression fix.

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

> The proposed patch abandons most of the envisioned niceties and
> instead employs a hack to just force a non-local exit and schedule a
> call to `erc-tls' when appropriate. It also instructs users to do that
> themselves in the future (issue an M-x erc-tls, that is). Hopefully,
> this makes for an acceptable compromise.

I've forsaken the first part out of an abundance of caution. So this now
just prints a warning and proceeds with a non-TLS connection. If anyone
finds that unsatisfactory, please say something.

> BTW, a POC patch set far more faithful to the original breadth of the
> feature (and way less hacky) is also attached. Perhaps it'll inform
> further exploration in this area down the road (but not for Emacs 29).

IOW, the de facto goal here is to make interactive `erc' a "universal"
entry point for both plain and TLS connections.

0000-v1-v2.diff
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0001-Fix-default-port-regression-in-erc-select-read-args.patch
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0002-5.6-Be-smarter-about-switching-to-TLS-from-M-x-erc.patch
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0003-5.6-Add-display-option-for-interactive-ERC-invocatio.patch
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0004-5.6-Optionally-prompt-for-more-ERC-entry-point-param.patch
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