fixes #2606: live highlighting unit test failure

This fix ensures that Live Highlighting is turned on at the beginning
of the test so that the toggling done by the test works properly.
Updated the test per gruehle's feedback. The test does not work presently,
though.
Merge branch 'master' into dangoor/2606-live-highlight-failure
fixes #2606 by performing tests in order depending on the state
of the Live Highlighting menu item.
Merge pull request #2708 from adobe/dangoor/2606-live-highlight-failure

fixes #2606: live highlighting unit test failure