1736393 - Lines in Tibetan text do not wrap properly on Windows

Status: RESOLVED FIXED

(Core :: Internationalization, defect)

Description

[Jonathan Kew [:jfkthame]]

STR: view a Tibetan page such as https://bo.wikipedia.org/wiki/%E0%BD%96%E0%BD%BC%E0%BD%91%E0%BC%8B%E0%BD%A1%E0%BD%B4%E0%BD%A3%E0%BC%8D in Firefox on Windows.

Expected: lines of text should wrap nicely into paragraphs.

Actual: they don't; we wrap only at ends of sentences.

This is because we rely on ScriptBreak to find potential line-breaks, but it doesn't adequately support Tibetan. We'd do better to handle it the same way we do on Android (since bug 1647377), by just treating each tscheg character as a potential break position, and not route Tibetan text through ScriptBreak at all.

(This will be superseded by the Unified Segmenter work when ready, but in the meantime it improves rendering and avoids win32k-lockdown issues.)

Comment 1

[Jonathan Kew [:jfkthame]]

Attachment: Bug 1736393 - Don't use ScriptBreak for Tibetan, just treat Tsheg character like a hyphen instead. r=m_kato

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/155f07d80dc5
Don't use ScriptBreak for Tibetan, just treat Tsheg character like a hyphen instead. r=m_kato

Comment 3

[Atila Butkovits]

https://hg.mozilla.org/mozilla-central/rev/155f07d80dc5