Issuing DOCUMENT_SIZE_CHANGED triggers document-loaded event.
This is accidental and historic, but the end result is that
the client assumes everything is invalidated and fires
initialization handlers, which are normally invoked the
first time a document is loaded. Undesirable when really
nothing has changed.

Change-Id: Ia4fa4479ca627b0f605e4ff5009f7e631a26f6d7