Malay Jawi letter ڽ 'NYA' appeared as wrong glyph in Noto Sans Arabic (UI)

[mnh48]

Defect Report

Title

Malay Jawi letter ڽ 'NYA' appeared as wrong glyph in Noto Sans Arabic (UI)

Font

1. NotoSansArabic-Regular.ttf
2. NotoSansArabicUI-Regular.ttf

Where the font came from, and when

Site: https://noto-website-2.storage.googleapis.com/pkgs/NotoSansArabic-hinted.zip
Date: 2018-05-19 (GMT+8)

Font Version

NotoSansArabic-Regular.ttf - Version 2.000;GOOG;noto-source:20170915:90ef993387c0; ttfautohint (v1.7)
NotoSansArabicUI-Regular.ttf - Version 2.000;GOOG;noto-source:20170915:90ef993387c0; ttfautohint (v1.7)

OS name and version

Windows 8.1 Single Language

Application name and version

No specific app, the issue is global.

Issue

The Jawi letter NYA (ڽ) which is used for the /ɲ/ sound in writing Jawi-scripted Malay language is appearing as wrong glyph in the initial form and medial form when I use both fonts.

In Noto Sans Arabic, the letter just uses the isolated form in place of initial and medial form.
In Noto Sans Arabic UI, the placement of the three dots are wrong, it should be below and not above.

For comparison, Noto Kufi Arabic and Noto Naskh Arabic UI displayed the letter correctly, and non-Noto font Times New Roman also displays correctly. (This is shown at Screenshot section below)

1. Steps to reproduce: just type as usual
2. Observed results: see screenshot, on first two rows
3. Expected results: see screenshot, on last three rows
4. Additional information: none

Character data

The unicode codepoint for 'NYA' (ڽ‬) is 06BD.

Screenshot

Tools for reporting bugs

Harfbuzz hb-view

Using the windows executable of Harfbuzz with the following input and command gives the corresponding output.

Input: in.txt
https://gist.github.com/MuhdNurHidayat/8630c720b064b6f3bcb9bad9fc768819

First command to test Noto Sans Arabic:
hb-view.exe --font-file "C:\Users\User\Desktop\NotoSansArabic-Regular.ttf" --text-file "in.txt" --output-file "out1.png"
Output:

Second command to test Noto Sans Arabic UI:
hb-view.exe --font-file "C:\Users\User\Desktop\NotoSansArabicUI-Regular.ttf" --text-file "in.txt" --output-file "out2.png"
Output:

Fontview

The tool is only released for OS X, I'm not a developer and I don't have the time to build the tool from source just for reporting wrong glyph.

Fontdiff

The tool is only released for OS X and Linux, I'm not a developer and I don't have the time to build the tool from source just for reporting wrong glyph.

[nizarsq]

Both issues reproducible in NotoSansArabic-Regular
NotoSansArabicUI-Regular

[nizarsq]

U+06BD current status in NotoSansArabic 2.002 and NotoSansArabicUI 2.002:
NotoSansArabic
U+06BD Initial and medial glyphs are missing from NotoSansArabic bug filed for known missing glyphs https://github.com/googlefonts/noto-fonts/issues/1856

NotoSansArabicUI
U+06BD Initial and medial wrong glyph in NotoSansArabicUI (dots should be below in Initial and medial forms)

NotoSansArabic 2.002
https://github.com/googlefonts/noto-fonts/tree/master/unhinted/ttf/NotoSansArabic/NotoSansArabic-Regular.ttf
NotoSansArabicUI 2.002
https://github.com/googlefonts/noto-fonts/tree/master/unhinted/ttf/NotoSansArabicUI/NotoSansArabicUI-

[nizarsq]

U+06BD current status in NotoSansArabic 2.002 and NotoSansArabicUI 2.002:
NotoSansArabic
U+06BD Initial and medial glyphs are missing from NotoSansArabic bug filed for known missing glyphs #123

NotoSansArabicUI
U+06BD Initial and medial wrong glyph in NotoSansArabicUI (dots should be below in Initial and medial forms)

NotoSansArabic 2.002
https://github.com/googlefonts/noto-fonts/tree/master/unhinted/ttf/NotoSansArabic/NotoSansArabic-Regular.ttf
NotoSansArabicUI 2.002
https://github.com/googlefonts/noto-fonts/tree/master/unhinted/ttf/NotoSansArabicUI/NotoSansArabicUI-

For tracking purpose NotoKufiArabic need fix as well

[nizarsq]

I need to check this issue in Kufi. Reopening.