Horizontal scrolling does not work as expected in TreeView, TableView, and ListView when trackpad or a mouse, which supports horizontal scrolling, are used.
Steps to reproduce:
1. launch TreeView, TableView, or ListView app
2. if needed, resize the app so the horizontal scrollbar will appear
3. with the horizontal scrollbar visible, try to scroll right
Result: the view scrolls down instead of right
Steps to reproduce:
1. launch TreeView, TableView, or ListView app
2. if needed, resize the app so the horizontal scrollbar will appear
3. with the horizontal scrollbar visible, try to scroll right
Result: the view scrolls down instead of right