Change the HeadingItem constructor to take a 'null' headingLevel
and store this internally with the constant. Change the JSON
serializer to convert this back to null.
Change-Id: I27508eed75d94b99c5189548919309f8da7deb75
Since times immemorial, and for reasons lost to history, our test code
was adding an extra <div> wrapper before parsing the HTML used for
tests. This wasn't a problem, until now, because I want to add some
tests for T303396 that need to check that the *real* wrappers present
in some test cases are handled correctly.
Changes to test cases mostly remove a leading "0/" from serialized
ranges, corresponding to removing the extra wrapper.
Change-Id: Ia50e3590538c8cd274b02d2a937ba1a3fbb4ac89