[Qt-interest] QTreeView, proxy model and expandable state

[Dmitry Baryshev]

Hi.

I use QTreeView+QFileSystemModel. It seems to work fine, all directory
items have expanable flag ("+" on the left side). Now I've added
QSortFilterProxyModel with only one reimplemented method - "bool
SortFilterProxyModel::filterAcceptsRow(int row, const QModelIndex
&parent) const". Now all directory items in QTreeView lost its
expandable state - no '+' elements.
QTreeView::setItemsExpandable(true) doesn't help. I don't understand
the logic why filtering affects expandable states? Could you please
help me with this strange problem? Thanks!

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