bug#40121: [PATCHv2] erc: fix erc-reuse-buffers behavior

[Lars Ingebrigtsen]

"Mingde (Matthew) Zeng" <matthewzmd@gmail.com> writes:

> By the definition of erc-reuse-buffers, if non-nil it should create a
> new buffer when joining channels with same names on different
> servers. The current behavior of erc-reuse-buffers is:
> 1. when non-nil, it will always reuse the same channel buffer,
> resulting in server A's channel gets reconnected to the channel with
> the same name of server B.
> 2. when nil, the buffer-name of the joined channel is
> '#channel/server'. However if one tries to '/join #channel' from the
> server buffer, it creates a new empty buffer with buffer-name
> '#channel', instead of opening the already-joined channel buffer.

Thanks; applied to Emacs 28.

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