Fixes bug in formatting element adoption agency algorithm #36
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As per the whatwg specs [1], further processing of formatting
elements has to stop if no "furthest block" is found on top of
the formatting elements.
This fixes bug in parsing the following snippet:
"foobarbaz" which would get parsed as:
"foobarbaz"
Reported as a bug in Parsoid [2]
All existing tests pass -- new tests required.
[1] http://www.whatwg.org/specs/web-apps/current-work/multipage/tree-construction.html#adoption-agency-algorithm
[2] https://bugzilla.wikimedia.org/show_bug.cgi?id=50604