Controls needed for italic slant direction

[r12a]

There should be means available to control the direction in which 'italicised' or 'oblique' text slants, since in some schools of Arabic script typography, text in these styles need to slant to the left.

See the example just below the large letters in this newspaper masthead.

For more details, see this GitHub issue, which is being used to track this gap. Please add any discussion there, and not to this issue.

[r12a]

The first comment in this issue contains text that will automatically appear in one or more gap-analysis documents as a subsection with the same title as this issue. Any edits made to that comment will be immediately available in the document. Proposals for changes or discussion of the content can be made in comments below this point.

Relevant gap analysis documents include:
Arabic/Persian • Hebrew • N'Ko