magit/git-modes — pull request #85 by npostavs (2014-01-05 17:28:53+00:00)
Title: ring-index must be non-nil if we saved a message

When ring-index is nil, log-edit-previous-comment goes to the "last"
item, which turns out to be the current message that has just been
saved, i.e. the message in buffer does not change.

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Half fixes #75 (and I'm giving up on the other half).