Bug 477283

Summary:	System settings marks all ".utf8" locales as invalid/unsupported, and glibc does not expose ".UTF-8" variants
Product:	[Applications] systemsettings	Reporter:	Neal Gompa <ngompa13>
Component:	kcm_regionandlang	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED FIXED
Severity:	major	CC:	hanyoung, marcan
Priority:	NOR
Version:	5.27.9
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
See Also:	https://bugzilla.redhat.com/show_bug.cgi?id=2250621 https://sourceware.org/bugzilla/show_bug.cgi?id=11629
Latest Commit:	https://invent.kde.org/plasma/plasma-workspace/-/commit/c9093f48d8ddc27c824fa00c06811a03692eb010	Version Fixed In:
Sentry Crash Report:

Description Neal Gompa 2023-11-20 13:49:40 UTC

SUMMARY
When the user sets the locale using the glibc form of UTF-8 locales (e.g. "en_US.utf8"), KDE system settings chokes on it because it only supports IANA variant "UTF-8", and not the glibc variant "utf8".

STEPS TO REPRODUCE
1. Ensure systemwide locale is set to a "lang.utf8" form (which is the form used in the system locale list)
2. Create a fresh user profile and start KDE
3. Go to System Settings > Region & Language > Language

OBSERVED RESULT
"The language "en_US.utf8" is unsupported"

EXPECTED RESULT
The language should be selected and behave normally.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Linux 39 (KDE Plasma)
(available in About System)
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.111.0
Qt Version: 5.15.11

ADDITIONAL INFORMATION
Reference bugs: 
* Sourceware: https://sourceware.org/bugzilla/show_bug.cgi?id=11629
* Fedora/RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=2250621

Comment 1 hanyoung 2023-11-20 14:06:58 UTC

Does set LANG to en_US.UTF-8 works correctly? We can implicitly convert "utf8" to "UTF-8"

Comment 2 Hector Martin 2023-11-21 03:26:13 UTC

Yes, UTF-8 works (not utf8, not utf-8, not UTF8).

Comment 3 Bug Janitor Service 2023-11-25 10:13:27 UTC

A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/3598

Comment 4 hanyoung 2023-11-26 06:22:42 UTC

Git commit 15c7bb2f5710de5dc303dd0963834630d666d907 by Han Young.
Committed on 26/11/2023 at 07:10.
Pushed by hanyoung into branch 'master'.

kcm_regionandlang: support glibc style 'utf8' variant

M  +2    -1    kcms/region_language/regionandlangsettings.cpp

https://invent.kde.org/plasma/plasma-workspace/-/commit/15c7bb2f5710de5dc303dd0963834630d666d907

Comment 5 hanyoung 2023-11-29 06:54:11 UTC

Git commit c9093f48d8ddc27c824fa00c06811a03692eb010 by Han Young.
Committed on 29/11/2023 at 07:53.
Pushed by hanyoung into branch 'Plasma/5.27'.

kcm_regionandlang: support glibc style 'utf8' variant


(cherry picked from commit 15c7bb2f5710de5dc303dd0963834630d666d907)

M  +2    -1    kcms/region_language/regionandlangsettings.cpp

https://invent.kde.org/plasma/plasma-workspace/-/commit/c9093f48d8ddc27c824fa00c06811a03692eb010