playout:SetAutoDir(auto_dir)
When this flag is on (the default), then paragraphs in the layout that begin with strong right-to-left characters (Arabic and Hebrew principally), will have right-to-left layout, paragraphs with letters from other scripts will have left-to-right layout. Paragraphs with only neutral characters get their direction from the surrounding paragraphs.
When False, the choice between left-to-right and right-to-left
layout is done according to the base direction of the layout's
Pango context. See pcontext:SetBaseDir() for details.
When the auto-computed direction of a paragraph differs from the
base direction of the context, the interpretation of
#PANGO_ALIGN_LEFT and #PANGO_ALIGN_RIGHT are swapped.
True, compute the bidirectional base direction from the layout's contents