Fixed missing hidden property in the metamodel
Changed -setHidden: to mark the receiver as needing a redisplay
Added ETNegateBooleanTransformer

Removed 'Value' mention in the name of ETBooleanFromMaskTransformer
Fixed -initWithObjectGraphContext: passing a nil context to the designated initializer
Added names for basic shapes and graphics group
Support custom row heights per item group in ETTable/OutlineLayout
Fixed ETTable/OutlineLayout selection not updated on -[ETController insertItem:atIndex:] when -selectsInsertedObjects is YES

Note: Solved the problem in a way that applies to all opaque layouts.