[XeTeX] TeX--XeT and OpenType fonts

[Philip Taylor]

Some fascinating behaviours manifested here :

> \font\OTtenrm="[lmroman10-regular.otf]/OT"
>
> \font \noto = "Noto Serif"
>
> \chardef \rtl "002F
>
> \chardef \ltr "002E
>
> \TeXXeTstate = 1
>
> \beginR
>
> abc \ltr‏ def \rtl‎ ghi \ltr‏ jkl \rtl‎ mno
>
> \beginR
>
> \OTtenrm
>
> abc \ltr‏ def \rtl‎ ghi \ltr‏ jkl \rtl‎ mno
>
> \beginR
>
> \noto
>
> abc \ltr‏ def \rtl‎ ghi \ltr‏ jkl \rtl‎ mno
>
>
> \end
>
** P.
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