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bug#28570: 27.0.50; [PATCH] Disable unhelpful default Extra: header in v

From: Dmitry Gutov
Subject: bug#28570: 27.0.50; [PATCH] Disable unhelpful default Extra: header in vc-dir
Date: Mon, 25 Sep 2017 03:24:15 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:56.0) Gecko/20100101 Thunderbird/56.0

On 9/23/17 6:39 PM, Göktuğ Kayaalp wrote:

The function ‘vc-default-dir-extra-headers’ is implemented as a stub
function that prints in the vc-dir buffer a rather annoying and
unhelpful message advicing that the implementer of a VC backend should
create some backend specific headers and that doing this is easy.
vc-rcs doesn't implement any (and I doubt it needs), and thus whenever I
use vc-dir on an RCS repository, this message is shown.  Attached is a
patch that disables this behaviour by making the said function return
nil instead (the function as it is includes a comment that says to do so
before the ‘release’).

Instead of changing the default, how about we create a RCS-specific implementation that does nothing? Because it doesn't need to.

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