Report on push/pull if heads are merged, too, like for new heads. Use case: If a remote repo has two heads and I _want_ to merge them, I merge and push. Meanwhile someone else pushed on top of one of the heads. He won't get a warning, because he doesn't create a new head, I won't notice that I don't close a head, because I don't get a message telling me.

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Is there an error message when trying to diff non-existing files?

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found: No such file or directory

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not: No such file or directory

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Is there an error message when trying to add non-existing files?

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found: No such file or directory

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not: No such file or directory