BDI: neutral when contains LRO or RLO without PDF

Test passes if the two boxes are identical.

א‮bcde...
א‮bcde...
א‮bcde...
a‭בגדה...
a‭בגדה...
a‭בגדה...
‭cbאde...‬
‭cbאde...‬
‭cbאde...‬
‭...הדaבג‬
‭...הדaבג‬
‭...הדaבג‬

For the purposes of applying the bidirectional algorithm to the paragraph-level container that a bdi element finds itself within, the bdi element must be treated like a U+FFFC OBJECT REPLACEMENT CHARACTER. Thus, if a BDI contains LRO or RLO characters lacking a matching PDF, these must not affect the visual ordering of the content outside the BDI.

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the-dir-attribute-083
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Assumptions: