https://bugs.documentfoundation.org/show_bug.cgi?id=162120

--- Comment #15 from Shai Berger <[email protected]> ---
(In reply to AvidSeeker from comment #7)
> 
> Note that plaintext does not necessarily mean that direction is not
> explicitly set. UBA defines right-to-left mark (U+200F) and left-to-right
> mark (U+200E), which could be set in a plaintext document.

I want to set straight this common misconception: RLM and LRM do *not*, in
fact, generally set paragraph directions — they are just characters with strong
directionality and zero width. If the "first strong" (UAX#9's P.3) rule is used
and they are first in the paragraph, then they do set the direction, but if the
rule is not used, they don't. Unicode does have characters that actually do
control directionality: LRE/RLE (U+202A & U+202B respectively), LRO/RLO (U+202D
and U+202E), all set the directionality for the text between them and the next
PDF (Pop Directional Formatting — U+202C) in subtly different ways. There's
also the newer U+2066--U+2069 (LR Isolate, RL Isolate, First Strong Isolate,
and Pop Isolation).

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