The point of packages like this is to make gtk based applications look better
when used in a Plasma environment.
Consider the idea of an installation that includes no gtk applications to start
with. In such an installation as this, the package has no immediate use, so not
having a gtk depends does no harm and keeps gtk off a system where it's really
Then later, when a gtk using application is installed, and gtk is pulled onto
the system because of it, it will automatically look nice because the oxygen
theme was already there.
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