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bug#19543: 24.4; vc-mode: 'Fileset is up-to-date' even when vc-diff show

From: Dmitry Gutov
Subject: bug#19543: 24.4; vc-mode: 'Fileset is up-to-date' even when vc-diff showed differences
Date: Sun, 17 May 2015 03:32:56 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.0

On 05/16/2015 07:19 PM, Ed Avis wrote:
Another way to make it consistent would be for vc-diff to work based on what is 
currently in the buffer, not what's on disk.

We could, but being consistent with out-of-date information is not that valuable.

But I think a better way to solve it would be for vc-next-action to include a quick check 
of the file's status on disk.  So before it confidently says "Fileset is 
up-to-date", it can go and test if the file has changed, and if so go into the usual 
Emacs prompts about whether to reload the buffer from disk.

I don't know; with TRAMP, for example, process calls are at a premium, and this would unconditionally increase their number, especially when committing many files.

Further, vc-dir already expects the state information to be up-to-date (it has some related checks and logic depending on it).

Aside from using auto-revert-mode, inferring the necessity of refresh from vc-diff output might be the best solution.

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