Subject: bug#2756: move SCCS later in vc-handled-backends

From: Stefan Monnier <[email-masked]>
Date: Mon, 23 Mar 2009 16:16:49 -0400

> SCCS should be moved after later in the vc-handled-backends list, after
> the modern VCs.
> Opening any file costs a call to vc-sccs-registered
> vc-sccs-search-project-dir (and whatever they call).

No matter where SCCS is in the vc-handled-backends list, those functions
will be run for any file that is not version controlled, which is likely
to be a very common case.

> SCCS is not really popular nowadays,

Same thing for RCS, indeed.

> and that should be reflected on the vc-handled-backends list.

We could remove backends from the list based on the presence/absence of
the corresponding executable(s).

        Stefan