There do not seem to be text direction controls. I see it does basic heuristic text direction guessing, apparently based on first strong LTR or RTL character in a paragraph, but this is often not adequate for determining text direction correctly, hence the need for explicit control, at least at the paragraph level, ideally also at subparagraph level. Any plans to add such controls? There are about a billion users of bidirectional languages (Arabic, Hebrew, Farsi, Urdu, Yiddish, et al).