On 1/11/2016 5:58 PM, Mohammad Hossein Bateni wrote:

Thanks for the explanation.  So the space after \textdir TLT is
meaningful but the one after \lefttoright isn't.  (I guess, I should
have used \textdir TLT\relax.  I'm going to use the high-level
\lefttoright command from now on.)

in addition to wolfgangs explanation: you can use grouping

foo {\righttoleft oof} foo

it's best to keep the spaces at the outer level so no

foo{ \righttoleft oof }foo

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