Public bug reported:
Improvement for ja-jp conf(69-language-selector-ja-jp.conf),
Dear language-support/selector maintainers,
[Problem description]
In Japanese language environments, ttf-unfonts-core breaks Qt apps/web browsers
font selection.
- If ttf-unfonts-core is installed, their application will neglect the
69-language-selector-ja-jp.conf.
- 'ttf-unfonts-core' is installed by task
dependency(ubuntu-desktop,kubuntu-desktop,xubuntu-desktop and so on).
Root problem is fontconfig or Unicode specification("CJK overlapping"), but
fontconfig-configuration could mitigate that.
So, 69-language-selector-ja-jp.conf patch is here.
[Background]
ttf-unfonts-core package's fontconfig has higher priority than
69-language-selector-ja-jp.conf's, but that is not root-problem. By historical
reason, unicode specification has overlapped CJK range, but
69-language-selector-ja-jp is not robust for CJK overlapping. So, CJK
fontconfig is nonpredictable minefield, any CJK related configuration has
potential risk like that. ttf-unfonts-core is not guilty.
Mechanism:
1) 69-(snip)-ja-jp.conf is constrained by { <test name="lang"
compare="contains"><string>ja</string></test> } COND. That COND limit the CJK
settings. That mean: "this font use for CJK at lang=ja is provided".
2) ttf-unfonts-core(and some font packages, microhei may include) has
not these COND, this configuration mean "this font use for CJK at
anytime".
3) Qt apps are not use lang contains (Notes: That contains are optional,
not Qt bug).
These configuration mean: "In Qt apps(and any apps with similar
implementation), you have to use ttf-unfonts-core".
So, our measures are:
a) Fix Qt and any others : Unrealistic...
b) Fix ttf-unfonts-core and any others : Unrealistic, better than a).
c) Fix 69-language-selector-ja-jp.conf : Reasonable.
Yes, c) is not fundamental solution, real solution is fontconfig
refactoring. But that is too difficult to fix:(
And,
- This approach had included at many CJK settings, that COND use at only ja-jp.
- This fix is widely well-tested. In "Ubuntu Japanese Remix 11.10"(released at
Oct 16) include the lang-deleted config, and not reported any side-effects.
<test name="lang">.. COND deletion is only extrication at the moment.
** Affects: language-selector (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/884645
Title:
Improvement for ja-jp conf (69-language-selector-ja-jp.conf): measure
for ttf-unfonts-core side-effects
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