New check: Check that U+FBB2–FBC2 are not marks

[khaledhosny]

What needs to be checked?

Check that the Arabic dot symbols are not marks in GDEF.

Detailed description of the problem

Unicode has a few spacing symbols representing Arabic dots and other marks, but they are purposefully not classified as marks. Many fonts mistakenly classify them as marks.

Resources and steps needed to reproduce the problem

The current version of Noto Sans Arabic ans Noto Naskh Arabic has this issue.

Suggested profile

• Vendor-specific: Google Fonts
• Vendor-specific: Adobe Fonts
• OpenType (requirements imposed by the OpenType specification)
• Universal (broadly accepted best practices on the type design community)
• Other:

Suggested result

• 🔥 FAIL (An issue that must be corrected for the font to function properly)
• ⚠️ WARN (A potential issues that may need to be addressed)

Severity assessment

4 as making them marks make them unsuitable for there original purpose (stand-alone symbols to used in pedagogical contexts discussing Arabic consonantal marks).