Subject: bug#75993: Special mode-class for diff-mode

From: Juri Linkov <[email-masked]>
Date: Sun, 09 Feb 2025 09:40:58 +0200

close 75993 31.0.50
thanks

>> So why don't we make `diff-mode` inherit from `special-mode`?
>
> Because it doesn't allow self-inserting keys in editable mode.

Ok, so now pushed.  The only problem was dependence of
view-mode activation on the symbol property with unrelated name
that is quite confusing.