Scrolling in ListBox with touch gestures is not working correctly

[dmrayt]

While scrolling with touch gestures in a ListBox, the touched item doesn't follow the finger as it should.
This make it very hard to scroll with gestures.

[kekekeks]

ListBox is currently incapable of smooth scrolling when virtualization is enabled, it can only scroll items one-by-one and reacts to mouse wheel 'steps'.
For now our ScrollContentPresenter attempts to accumulate the scroll delta and somehow translate it into mouse wheel scroll steps.

Obviously that's an imperfect solution. There is currently work in progress to make our containers to use ItemsPresenter which will enable smooth scrolling for virtualized listboxes, we expect it to be available in the next release.

[dmrayt]

The problem is the fixed value for ScrollContentPresenter.LogicalScrollItemSize. This should be the size of the item as noted in the source code comment, or at least it should be configurable.
I've tested it with a value of 13 and it's (in my case) much better.

I will wait for the ItemsPresenter.

[robloo]

Somewhat related, not sure if I should open a new issue: Using the mouse Scroll Wheel over the expanded-state ScrollBar doesn't scroll the ListBox. Using the Scroll Wheel on the ListBox itself works just fine.

[maxkatz6]

@robloo it's better to create another issue. As I understand, scrollbar handles wheel event instead of listbox under it.