Fixes an AssertionFailure concerning #doLayoutAgain when a particular arrangement of EToys tiles is laid out.
TileMorph wants to change its owner's layout policy if that is a TilePadMorph as soon as it is embedded into that. However, the wrong hook was chosen for this. #ownerChanged is signaled whenever the owner has changed its layout. Instead, #noteNewOner: is signaled whenever the receiver is embedded into a new owner. Note that this practice of lazy layout modification is still suspect from my perspective, but at least it works again.
Pooh, this one was really hard to find. Thanks a lot to Marcel (mt) and the MessageSendRecorder for their important help! ;-)
=============== Diff against EToys-eem.400 ===============