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Funny how it triggered a bug in Firefox. When the tab is unfocused, its title in the handle is "𝑼𝒏…", but when it gets the focus it becomes "𝑼<D835>…" (in a

by emillon 12y ago

Funny how it triggered a bug in Firefox. When the tab is unfocused, its title in the handle is "𝑼𝒏…", but when it gets the focus it becomes "𝑼<D835>…" (in a square box). The next codepoint is U+1D48F whose UTF-16 BE encoding is d8 35 dc 8f. I'd say that the truncation algorithm operates on bytes and that it can't make sense of d8 35, but I'm not too sure how to fix that since graphemes can have arbitrary length (right?). Do you have to compute the width in advance?

jabiko 12y ago
It seems like this is a known bug: https://bugzilla.mozilla.org/show_bug.cgi?id=921528 https://bugzilla.mozilla.org/show_bug.cgi?id=921528
anon1385 12y ago
http://www.unicode.org/reports/tr29/ http://www.unicode.org/reports/tr29/ There are libraries for doing it in Javascript: https://www.npmjs.org/package/grapheme-breaker https://www.npmjs.org/package/grapheme-breaker (is that part of the Firefox UI done in Javascript? I've no idea)
pwnna 12y ago
Hm.. i'm on nightly and seems to be unaffected by this problem.
- emillon 12y ago
  It depends on the size of the tab headers.
pc86 12y ago
I am using FF Dev Edition and see "Unico<D835>..." regardless of focus. Weird.
aninhumer 12y ago
>I'd say that the truncation algorithm operates on bytes This seems likely, as another notable weirdness is that even with full width tabs, where there's plenty of space for at least "𝑼𝒏𝒊𝒄𝒐𝒅𝒆 𝑻𝒆𝒙𝒕..." it still only shows "𝑼𝒏𝒊𝒄𝒐...".