[p4] Accidental checkout

[Robert Cowham]

> Make sure to not use P4Win when reverting that many files. 
> The problem is that P4Win is doing a p4 revert -an before 
> doing the actual revert. It should not. I think it's an old bug.

This behaviour is controlled by Settings > Options > changelists >
automatically delselect unchanged files before submit.

While in some circumstances such as with large changelists, this is
undesirable, for everyday use I find it invaluable.

> In any cases, I prefer using p4 revert directly on the 
> command line. For big changelists to revert, the command line 
> is often faster.

Absolutely.

Robert