Client transitions still need to render in order (#962)
Client transitions still need to render in order (#962)

During client transitions the root structure is built up using a state machine
that requires an in-order render. First render can still go out of order
because the server has already laid out the root structure.

This fixes #961.
lidawang/react-server,redfin/react-server,lidawang/react-server,emecell/react-server,emecell/react-server,redfin/react-server