Scrollbar is not shown with following conditions.
- Resize QListView::viewport() to less than contents with using setFixedHeight()
- Set QAbstractItemView::ScrollPerPixel for verticalScrollMode.
Expected: Show scrollbar anytime even resizing window.
Actual: Does not show scrollbar when launch app.
It’s reproducible with attachment sample on Ubuntu, and sometime Windows 10. (On Windows 10, that reproduces if resizes window to expand)
And if use QAbstractItemView::ScrollPerItem, it works normally.