https://bugzilla.redhat.com/show_bug.cgi?id=1078661
Bug ID: 1078661 Summary: Deprecate the usage of U+0BB8 U+0BCD U+0BB0 U+0BC0 for SRII per latest unicode standard Product: Fedora Version: rawhide Component: lohit-tamil-fonts Severity: medium Assignee: psatpute@redhat.com Reporter: srik.lak+public@gmail.com QA Contact: extras-qa@fedoraproject.org CC: fonts-bugs@lists.fedoraproject.org, i18n-bugs@lists.fedoraproject.org, psatpute@redhat.com
Description of problem:
Complex glyph SRI was changed from U+0BB8 U+0BCD U+0BB0 U+0BC0 to U+0BB6 U+0BCD U+0BB0 U+0BC0 in Unicode 4.1. Lohit-Tamil displays the complex glyph for both forms for backward compatibility. However this also prevents migration to latest standard as some input tools too offer same functionality leading to more content created with U+0BB8 U+0BCD U+0BB0 U+0BC0 as SRI which increases the need for backward compatibility. To break this vicious cycle, I propose U+0BB8 U+0BCD U+0BB0 U+0BC0 should not be substituted with complex glyph SRI and should be displayed normally. Apple / iOS fonts already do this complying with latest unicode standard. Failing to move to single consistent representation in line with latest unicode leads to fragmentation within unicode text, a greater cause for worry than backward compatibility.
I understand the larger problem of standardization cannot happen only by changing this font, but its a start and Lohit being the only maintained free Tamil font, can help in the process.
Version-Release number of selected component (if applicable): 2.5.3
How reproducible: Always
Steps to Reproduce: 1. ஸ்ரீ (U+0BB8 U+0BCD U+0BB0 U+0BC0) should be displayed as ஸ்(U+0BB8 U+0BCD) ரீ(U+0BB0 U+0BC0) without a space in middle and not compounded form.
Actual results: U+0BB8 U+0BCD U+0BB0 U+0BC0 giving complex glyph SRI
Expected results: U+0BB8 U+0BCD U+0BB0 U+0BC0 should not give complex glyph SRI, should give U+0BB8 U+0BCD and U+0BB0 U+0BC0 seperately.
Change Required: The line
Ligature2: "'abvs' Above Base Substitutions in Tamil lookup 0 subtable" u0BB8_u0BCD.half u0BB0 u0BC0
in Lohit-Tamil.sfd should be removed.
Additional info: See also bug 450699