[Bug 918758] [NEW] QT incorrectly determines the default locale from the LC_* variables

[Captain Chaos]

Public bug reported:

QT 4.4, included in Ubuntu Oneiric Ocelot, incorrectly determines the
default locale, causing QT-based programs to use the wrong language for
the user interface, among other things.

There is already a bug report for this in QT:
https://bugreports.qt.nokia.com/browse/QTBUG-1313. According to that
report the bug has been fixed in version 4.8. Is it possible to either
upgrade QT to 4.8, or backport that fix?

The problem appears to be that QT incorrectly uses the LC_NUMERIC
variable to determine the default locale (when it should only determine
the number format to use), and ignores the LANG variable. My locale
settings are as follows:

LANG=en_US.UTF-8
LANGUAGE=en_US:en
LC_CTYPE=nl_NL.UTF-8
LC_NUMERIC=nl_NL.UTF-8
LC_TIME=nl_NL.UTF-8
LC_COLLATE=nl_NL.UTF-8
LC_MONETARY=nl_NL.UTF-8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=nl_NL.UTF-8
LC_NAME=nl_NL.UTF-8
LC_ADDRESS=nl_NL.UTF-8
LC_TELEPHONE=nl_NL.UTF-8
LC_MEASUREMENT=nl_NL.UTF-8
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

And yet QT based programs (in contrast with all other programs on my
computer) use Dutch for the user interface, when they should be using
English as indicated by the LANG variable. Setting LC_ALL causes them to
use English, but that is not an acceptable solution since LC_ALL
overrides all the other LC_* variables.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: libqtcore4 4:4.7.4-0ubuntu8
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Thu Jan 19 16:50:29 2012
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
SourcePackage: qt4-x11
UpgradeStatus: Upgraded to oneiric on 2011-11-23 (57 days ago)

** Affects: qt
     Importance: Undecided
         Status: Fix Released

** Affects: qt4-x11 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug oneiric

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Title:
  QT incorrectly determines the default locale from the LC_* variables

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