stylesheet on QTreeWidget doesnt work when custom delegates are set.

Run the attached test app,

If you use Line 46 instead of 39 in main.cpp, you would see it works ( QTreewidget works )

If you use line 39 and comment out line 49, you would see it works again ( custom Treewidget works when a custom delegate is not used ) .

If you use 39 and 49 together, then it doesn't work as expected.