Fix the newline bunny-hop bug

We would dirty-diff "</span>\n<!-- comment -->\n<span>" to
"</span>\n\n<!-- comment --><span>", i.e. the second newline made
a bunny-hop to the left over the comment.

The actual bug turned out to involve a double bunny-hop, with
"</span> <!-- comment -->\n<span>" turning into
"</span>\n <!--comment --><span>", i.e. the newline bunny-hops
both the comment and the space.

This happened because outputWrappedMetaItems() didn't take
wrappedWhitespace into account when restoring meta items and
associated whitespace. I hacked a check for wrappedWhitespace into it,
but we should really just rewrite this pile of hacks into a unified
system for queuing and processing both whitespace and metadata.

Change-Id: I4375f4c07983ffec6877d0371aeaa9bf6e65fd6e
Merge "Fix the newline bunny-hop bug"