To a large extent, how xterm should behave depends on the data. Hebrew data
in Unix systems is mostly Visual, i.e. xterm should not perform bidi
processing. I understand that Arabic data is normally or always Logical, in
which case bidi processing is required.
Moreover, Windows Hebrew is Logical, so many users would like to move from
Visual to Logical.
In conclusion, I believe both behaviors are needed, with a way for the user
to choose, similar to the way the charset information in HTML tells the
browser whether the Hebrew is Visual or Logical.
With Logical support the application does not have to be fully bidi-aware.
Visual requires most applications to be very much aware of bidi. However,
there are quite a number of existing Visual Hebrew applications.
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