Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  b8a3b4a3cb0037de6847134e7ccd3a4c35458f20

Separate data/metadata split and node tree loops

It's not much of an optimisation to combine these loops but
separating them gives us greater flexibility.

Move the building of the node tree to happen lazily when
getDocumentNode is called.

In the rich paste path we can now create the DM without building
the node tree and remove the metadata.

Change-Id: I10b4bc486ff8ff8037158aa6dfd45aac87557d42