- Transient scroll bar is available for StudioStyle.
- Some changes are applied to slider style, because scrollBar and
sliders have some common usages within the style.
Task-number: QDS-9283
Change-Id: I7a8b7997cf4d20142a0524c4a071b93dfd06321d
Reviewed-by: Henning Gründl <henning.gruendl@qt.io>
