Eric Muller wrote:

> I believe that the current mirrored and mirrored glyph properties are 
> useful only when no help can be obtained from the font; otherwise, the 
> resolved directionality should be provided to the font, which should 
> then select the appropriate shape for each and every character, 
> regardless of the mirrored and mirrored glyph properties.


Correct, and this is how the BidiMirroring.txt file is intended: Only if the layout 
engine+font are not smart enough, as a fallback mechanism.

The file itself says:
# Note that for "real" mirroring, a rendering engine needs to select
# appropriate alternative glyphs, and that many Unicode characters do not
# have a mirror-image Unicode character.


markus



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