bug#60525: 29.0.60; tree-sitter support in semantic-symref

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: dgutov@yandex.ru,  larsi@gnus.org,  juri@linkov.net,  
> 60525@debbugs.gnu.org
> Date: Wed, 04 Jan 2023 13:07:47 -0500
> 
> - make the various variants of a major mode all inherit from a shared
>   parent mode (and then use that shared parent mode in
>   `semantic-symref-filepattern-alist`).

This idea was tried, but it doesn't work well enough, at least not for
all such mode pairs.

> - Use `set-auto-mode--last` which remembers the mode specified before it
>   was remapped by things like `major-mode-remap-alist` (or by dispatch
>   functions like `tex-mode`).

I'd need to see the code to reason about it (though I understand the
general idea).