VCS: Use documents instead of editors a bit more.
This patch mostly gets rid of EditorManager::openedEditors usage. The VCS editors should have a better widget<>document separation, also to make it possible to split/duplicate them, but that's for another time. Change-Id: Idd92a6a4884ff69fba4f4793d182aa7ff68d79e4 Reviewed-by: Tobias Hunger <firstname.lastname@example.org>
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