make collapsing filters work for VS 2005
make collapsing filters work for VS 2005

Just walking the tree of UI items expands them in VS 2005.
Sounds strange, makes no sense but its true.
Now we're saving the expansion state before entering an item
and restoring it after we're finished with our search for the
project item.

lakiduo/QtAddin,lakiduo/QtAddin,lakiduo/QtAddin,lakiduo/QtAddin,lakiduo/QtAddin,lakiduo/QtAddin