GNU bug report logs - #67008
30.0.50; Multiple major mode parents

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From: Dmitry Gutov <dmitry <at> gutov.dev>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>, 67008 <at> debbugs.gnu.org
Cc: Ikumi Keita <ikumi <at> ikumi.que.jp>
Subject: bug#67008: 30.0.50; Multiple major mode parents
Date: Sat, 11 Nov 2023 02:01:57 +0200

On 09/11/2023 07:38, Stefan Monnier via Bug reports for GNU Emacs, the 
Swiss army knife of text editors wrote:
> While it seems difficult to add support for multiple inheritance to
> `define-derived-mode`, it's fairly easy to allow a major mode to declare
> itself the spiritual heir of various other major modes beside the one
> from which it actually inherits.

I think it would help with certain customizations which check whether a 
mode is derived from e.g. js-mode.

But whatever code that runs in parent-mode-hook won't run in the 
"derived modes" that use the new mechanism, would it?

I wonder which of these two problems have a bigger impact for the 
seamless migration to ts modes.

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