Click support for paging?

Would adding click support on scrollbar areas (outside the scroll handles, but inside the invisible scroll axes) be considered for paging? Having this feature would make the replacement scrollbars on par with the native scrollbars.

I'm just wondering if the lack of click support is by design, or something that can be considered if someone is willing to do it.

The issue does not name files, tests, or an entry point. Start by locating the scrollbar interaction handling and clarify whether clicks on the areas outside the handles should page in the clicked direction, then define completion as matching native scrollbar paging behavior without disrupting handle dragging.

Written by the indexing model from the issue text.