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I tried to invoke cvs|diff action on a modified file. The file had changed only its timestamp but the diff window was shown. Is this the right behaviour?
It depends. If you diff an entire project, you can see all 'blue' files in diff. If you diff a single file, you maybe expect only a message box saying that the file did not change. I will mark this as an enhancement: remove all files from diff that are not really modified, show only a message box if diff action would open an empty view.