Steps to reproduce:

1) Start HelloTableView
2) On right hand side, select 'Multiple Rows'
3) Select multiple rows in TableView
4) Click on the 'Performance Test' tab
5) Resize the window horizontally
6) Click on the 'Simple' tab
7) Click on the TableView so that the selection changes

See attached screenshot for what I see when I do this. When I run with dirtyopts disabled, this is no longer visible. It appears to be the case that the newly exposed area of the TableView (i.e. what was previously clipped and required horizontal scrolling) hasn't been redrawn.