Once upon a time, John Pierce jhn.pierce@gmail.com said:
otoh, its pretty rare that an update has a new dependency... if the package is installed, its existing dependencies are also installed, and if they have updates, check-update would show them all, would it not?
It's not as rare as you might think, especially at point-release time. There are often new dependencies when packages get updates beyond just bug patching, sometimes an installed package might get obsoleted by a different package (can't remember if that shows up in check-update), etc.