Took a while to figure out, but the problem was that the support
libraries ListFragment would only ever use getActivity() when
creating widgets. What we really needed was the ability to use
an alternative context, namely a ContextThemeWrapper. If this is
passed to the constructor of a widget, it is themed appropriately.
To make it work, we now create our own list view in onCreateView()
(which is really a copy of the code from the android list_content.xml
file anyway). There are also some workarounds for a bug in the
support library with regards to using your own view.
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