Split package versions in testing (due to libplasma CI failure)

[Hefee]

Hey,

> Migration of some KDE 6.6 packages have been stuck for a week,
> apparently because of autopkgtest failure for libplasma/6.6.3-2. This
> means testing contains a mix of 6.5 and 6.6 packages. A similar state
> has caused problems for other users in the past (see e.g. #1118916
> (plasma-desktop: System tray crashing on startup)).

Yes this is a known issue for quite some time.

> 1. Is it known when this CI failure will be resolved so the remaining
> packages migrate to testing

Well we won't touch the plasma packages till the migration is done. because  
the CI failures do not stop the transition. The blocking bit is 
plasma5support, that needs to end for 5 days in unstable. In two days Plasma 
6.6 will hopefully migrate to testing. Than we can fix those issues.

> 2. Is the current state of unstable suitable for `apt install -t
> unstable plasma-desktop`?

I don't know, because I didn't tested it. The problem why we have those half-
migrated state is that the plasma packages are too loosely coupled and the 
migration tool do not understand that plasma is one bundle. That's why only 
upgrade plasma-desktop ends maybe still in a half-migrated state. You have to 
look at it very closely if you upgrade every plasma package to 6.6.
I would recommend to wait some more days. Than the migration should be 
finished.

> 3. Is it possible to do anything with the packaging/migration to avoid
> this half-migrated state for the major point releases in future?

We hope yes ;) With 6.6 we created a package to bundle all plasma packages 
together, so it is not possible anymore to mix different plasma versions. This 
bundle package is named plasma-version and all plasma packages depend on 
plasma-version-base-6.6.
With a newer Plasma they will depend on 6.7 and so on with that apt is forced 
to remove all old packages, because  plasma-version-base-6.6 conflicts against 
plasma-version-base-Y.X. But this bundling was introduced together with Plasma 
6.6 packages, so it does not help for the current transition from 6.5 -> 6.6.
But hopefully it is the last half transition to testing.
 
Regards,

hefee
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