mono/mono — pull request #987 by StephenMcConnel (2014-04-09 21:05:11+00:00)
Title: Adjust scrollbar display after layout if autosized children

ScrollableControl.OnLayout sets the scroll bar display before doing the
actual layout. If any children are autosized, they may change size as
a result of the layout, and that may change whether or not the scrollbar
is needed. (This addresses Xamarin bug 18874.)