[Qt-interest] QTreeView and QSortFilterProxyModel

[Daniel]

Hi all,

I have a custom QTreeView and a custom QSortFilterProxyModel with a
reimplemented filterAcceptsRow function.
Assume, the model contains:

- group1
   - item11
   - item12
- group2
   - item21
   - item22

Now I apply a string filter "item2?" only for the items, so group 1 would
empty. This works without problems and results in:

 group1
-group2
   - item21
   - item22

I want the empty toplevel groups to be hidden, e.g.

-group2
   - item21
   - item22

I have tried to determine the number of children that pass the filter within
filterAcceptsRow with no success.
Another approach was to hide the empty toplevel row in the QTreeView
reimplementing drawRow, but this ended up still showing an empty line.

Any ideas, friends?
Daniel
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