bug#35351: 27.0.50; Enable derived modes to run their own very-early 'change-major-mode-hook' code

[Phil Sainty]

I forgot to mention the other hack solution which occurred to me,
which is for the library which defines the major mode to add its
own before-advice for that major mode function.

This also seems a bit ugly to me -- but maybe not quite as ugly
as using a 'fake parent' mode.  It's a slightly more flexible
solution, at any rate.


-Phil