"Configure Language" option

[Albert Astals Cid]

El dimarts, 25 d’octubre de 2022, a les 19:49:30 (CEST), Friedrich W. H. 
Kossebau va escriure:
> Am Dienstag, 25. Oktober 2022, 17:16:15 CEST schrieb Friedrich W. H. 
Kossebau:
> > Am Montag, 24. Oktober 2022, 23:38:15 CEST schrieb Stefan Gerlach:
> > > i noticed that several KDE apps lack the ability to switch the UI
> > > language
> > > when using the "Configure Language" dialog. The .mo files are correctly
> > > installed, all the languages are in the selection box and the
> > > configuration
> > > is saved in the klanguageoverridesrc file which is read on startup. But
> > > somehow (most of) the UI strings are shown in the system language only.
> 
> On a second read I see you actually talk about the custom app language
> feature. Was getting off the path here by all the other issues I saw in the
> normal Step run and the rabbit holes I had to enter there :)
> 
> Now gave that another try, with Step, given I was already warm with the
> codebase, and tested by using French as custom language over my system
> German. And saw that indeed some UI terms were still in German language,
> despite there being a French qm file.
> 
> Looking into the code, there might be chance for a race condition:
> the custom code generated by the cmake macro ecm_create_qm_loader (from
> ECMPoQmTools) uses Q_COREAPP_STARTUP_FUNCTION to hook the QTranslator
> generation code for that catalog into the startup during the QApp instance
> creation.
> 
> Though the code from kxmlgui which does checking of the klanguageoverridesrc
> config and then trying to adjust things by setting the LANGUAGE env var
> respectively also uses Q_COREAPP_STARTUP_FUNCTION.
> 
> So there might be some chance of race condition. And things only worked by
> chance at least for the tier1 KF libraries which use that because the
> registered functions are done in an order after the kxmlgui one, due to the
> order of libraries that are loaded and their static data is initialized? But
> then fail for anything else whose hook is executed before the kxmlgui one,
> as the ecm_create_qm_loader code seems to not have any update logic?

Added
https://invent.kde.org/frameworks/extra-cmake-modules/-/merge_requests/302

Seems to work for me in step.

Cheers,
  Albert

> 
> As I dislike the Qt translation system personally, myself have sadly to opt
> out here. Hopefully there are others with energy on that matter here.
> 
> Cheers
> Friedrich