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

[Dmitry Gutov <dgutov@yandex.ru>]

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We could, but being consistent with out-of-date information is not that 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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Please drop this nonsense. The above text makes it seem like I can't 
even quote your message here because a copy goes to the public bug tracker.