Draft: Cleanup list-base view click pressed

Our view click handling has an unnecessary workaround to deal with the propagation from item clicks. We set the flag deny_background_click when an item is clicked, and then clear it on release/stop. This is a little hard to follow and I think might be contributing to problems such a quasi-activated state for some items.

Set the propagation phase to TARGET on the view. This works out of the box for the GridView. ColumnView is implemented using a child ListView, so we have to get that by looking at the child's silbing.