https://bugzilla.wikimedia.org/show_bug.cgi?id=21974
Summary: Changing content language code causes
Special:Preferences to permanently throw an exception
for some users
Product: MediaWiki
Version: 1.16-svn
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Normal
Component: Language converter
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Due to a bug in LanguageConverter::getPreferredVariant(), the default option
for user variant ends up being whatever variant the current user already
selected in their preferences. This is usually not a problem, but when the
content language changes, the list of allowed variants changes, and so
Special:Preferences can throw an exception on startup: "Global default 'sr-ec'
is invalid for field variant".
This makes it impossible for the user to change their preferences.
The bug in LanguageConverter::getPreferredVariant() is the fact that it doesn't
respect $fromUser=false when there's already a variant cached in
$this->mPreferredVariant which did come from the user. Annotation suggests that
it's been there for years.
Assigning to Philip since I made him the default assignee for language
converter bugs, CCing to Andrew for his thoughts about whether this is an
appropriate failure mode for Special:Preferences.
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