Add a flag so QSortFilterProxyModel can filter parents without visible children

Hi

I am using QSMP and one thing that is hard to implement without consumming too much resources is filtering an index, whose children are all filtered out.

Using the `recursiveFilter` flag or another, you could, when an index is filtered, check if all it's siblings are filtered too, and then, emit a signal so that the view would refresh the parent index ?

This is currently :

• impossible to do it, as `view.update(index)` does not seems to call again the `filterAcceptsRow`
• very resource consumming if we have to call `invalidateFilterAcceptsRow` for each parent index.

 
I have already discussed the matter on the forum, and it seems there is no good solution at the moment.

https://forum.qt.io/topic/161902/qsortfilterproxymodel-filter-parents-without-visible-children.

 
Thank you.

PS:I can provide a short exemple using python.