Comment 10 for bug 2008968

SUMMARY

In Kubuntu and Lubuntu/UbuntuStudio 23.04 (which both ship discover), 5.27.2 discover 'home' tab never loads at startup, or when re-selected after viewing another tab.

Additionally, while discover is both the foreground application and the home tab is active, discover process uses a high cpu load. Selecting another tab or another app as foreground cuts off the usage.

Downstream bug: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/2008968

STEPS TO REPRODUCE
1. Run the daily live 23.04 ISO from http://cdimage.ubuntu.com/kubuntu/daily-live/current/ and start discover; or
2. Install discover 5.27.2 on 22.10 via ppa:kubuntu-ppa/backports

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Packagekit: 1.2.6-3 (direct sync from debian testing/unstable)

ADDITIONAL INFORMATION

Appears to be a regression introduced by commit https://invent.kde.org/plasma/discover/-/commit/5dadd14ff12b8a6afae2c557d5948c5c66e1898c

This was confirmed by git bisect of the changes in 5.27.2 since 5.27.1, and confirmed by test adding a patch reverting that commit to our packaging.

Konsole output after several launches:

lunar@lunar:~$ plasma-discover
fetch ratings! false
adding empty sources model QStandardItemModel(0x56409f738490)
no component found for "com.ubuntu.ubuntu"
packagekitqt.transaction: Unknown Transaction property: "Sender" QVariant(QString, ":1.94")
packagekitqt.transaction: Unknown Transaction property: "Sender" QVariant(QString, ":1.94")
packagekitqt.transaction: Unknown Transaction property: "Sender" QVariant(QString, ":1.94")

which does not differ from 5.27.1 or the reverted state as far as I can see. Though there is some variation on output from testers.