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bug#18535: tramp alters `vc-handled-backends'

From: Stefan Monnier
Subject: bug#18535: tramp alters `vc-handled-backends'
Date: Tue, 23 Sep 2014 11:37:20 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

> `tramp-sh-handle-vc-registered' can permanently alter the value of
> `vc-handled-backends' causing Emacs to stop recognizing version
> controlled files as such.  This happened to me a couple of times after
> having pressed `C-g' while some `tramp' operation was apparently
> hanging.

The current code uses a `let' binding, which uses the same mechanism as
unwind-protect, so I don't think that's the source of a the problem.

The `delq' look dangerous on the other hand.  Shouldn't these be
`remq' instead?


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