bug#68646: 30.0.50; ERC 5.x: erc-channel-hide-list doesn't hide certain messages

[J.P.]

Tags: easy, help

>From emacs -Q:

  1. (setopt erc-channel-hide-list '(("#chan" "NICK" "353")))
  2. M-x erc RET ... RET
  3. /JOIN #chan
  4. Notice the names manifest and nick changes still appear

Hints:

- How do `erc-server-353' and `erc-server-NICK' find the right
  buffer(s) to print their messages in?

- How does `erc-hide-current-message-p' find the channel name to filter
  against?

- Would allowing `erc-hide-current-message-p' to accept an optional
  `buffer' argument help? What if `erc-display-message' were to call
  something like an `erc--hide-current-message-p' instead of
  `erc-hide-current-message-p'? Any downsides to such indirection?

- How might we write a test to demonstrate the current buggy behavior?

Although fixing this specific issue is relatively easy and very much
welcome, a comprehensive overhaul of all `erc-ignore' related
functionality would be even more welcome but is admittedly also more
involved. (BTW, please only share answers to the hint questions above
if you're willing to take on this bug.)


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.17.6) of 2024-01-04 built on localhost
Repository revision: 1081e975c9370999df1a288b117bfd9053050d21
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12014000
System Description: Fedora Linux 37 (Workstation Edition)

Configured using:
 'configure --enable-check-lisp-object-type --enable-checking=yes,glyphs
 'CFLAGS=-O0 -g3'
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

Configured features:
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Load-path shadows:
None found.

Features:
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Memory information:
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