{macOS} Regression: setting stylesheet on QTabWidget::pane hides the close graphic on tab

Setting a stylesheet for QTabWidget::pane will cause the close "X" to not be displayed on the tab.

Using the dialogs/tabdialog example, add the following two lines in tabdialog.cpp after the QTabWidget (tabWidget) is created:

tabWidget->setTabsClosable( true );
setStyleSheet( "QTabWidget::pane { margin: 0 0 0 0; }" );

It doesn't seem to matter what I am setting in the style sheet, the close "X" graphic will not be displayed anymore. Remove the setStyleSheet call and the "X" is displayed.

I have not been able to come up with a workaround for this. It stopped working with 5.9.