Created attachment 8485627 [details] testcase Per discussion just above https://www.w3.org/2014/09/08-css-irc#T08-41-14 , we should break ligatures at all bidi isolation boundaries. This should end up in css3-text; we should check that the spec actually matches the discussion before implementing. Note that despite this, we should still ligaturize the second and third examples in http://lists.w3.org/Archives/Public/www-archive/2014Sep/att-0001/lig.html (but not the first, since it has a level change).
This is also in the Unicode spec: http://www.unicode.org/reports/tr9/#Shaping
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