fponticelli/dhx — pull request #6 by jdonaldson (2012-10-15 21:18:39+00:00)
Title: Update merge, take 2

This should cover the remaining cases where merges were not being handled appropriately:

Update merging was only happening on PreEnterSelection.

This commit adds back an EnterSelection class, and
gives it the merge behavior as well.

The other two channels for update/exit still are
treated as BoundSelections