N'Ko tone marks should all be at the same height

[r12a]

This issue is applicable to N’Ko.

The World Organization for the Development of N'Ko prefers that all tone marks should appear at the same height above the baseline, rather than changing height according to the height of the base character to which they are attached. This image shows the preferred behaviour.

More:

• N'Ko Layout Requirements, Context-based shaping & positioning

The GAP

The Noto Sans NKo font varies the height of the tone mark according to what it rests on. (The other major N'Ko Unicode fonts, Ebrima, Conakry, and Kigelia place tones at the same height.)

More:

• N'ko Context-based shaping & positioning: Diacritic placement #30

Tests & results

Character app test. Install the latest Noto Sans Nko font. Open the page and select Noto Sans NKo from the 'Current font' pulldown. Test passes if both tone marks are at the same height.

Action taken

Issue, Noto

Outcomes

The latest release of the Noto N'Ko fonts now set above marks at a constant height. This means that all major N'Ko fonts now behave as expected.

Priority

Although this is the preference, the text is still readable, so this is marked as Advanced.

[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 Editor's draft of the document. Proposals for changes or discussion of the content can be made by adding comments below this point.

Relevant gap analysis documents include:
N'Ko