ASTextNode2 was only setting truncationMode (lineBreakMode) on existing paragraph styles in attributedString (thus having no effect for the two non-truncating modes if there were not any existing paragraph style runs).

ASTextLayout (essentially YYTextLayout) was not rendering the two non-tail truncation lineBreakModes correctly. There's not much history on github but it appears to me that it was set up correctly at one time and then some additional code was added for unclear reasons that assumed any truncation was at the end of the string.

This commit corrects both issues.