Hi! Qt 5.15 is completely in unstable now and already also migrated to testing. kdevelop had to be uninstalled on my system, but I bet a fix will be coming soon enough as well.
Now Plasma 5.19.5 is also coming. As always just wait till apt dist-upgrade is safe to do. If you previously used experimental packages, the updates should be seamless, but if you still use 5.17, better wait till everything is complete. I already have Qt 5.15 and Plasma 5.19.5 experimental packages installed and they are working just fine. There was an issue with window rules editing pane in System Settings not displaying, but this was just a missing dependency that should be fixed with the next upload. To fix manually install: qml-module-org-kde-kitemmodels Thanks to the effort of the Qt/KDE team the Qt/Plasma/KDE Applications stuff is quite up to date in Debian by now! Thanks to everyone involved. This has been quite a large feat to complete. Thank you also very much for the nice cooperation I am seeing these days! It really shows that together it is easier to achieve all of this. You can help, too: In case you experience bugs it is good to first check whether you have all packages updated. At least to some extent packages should be updated in lock step due to versioned dependencies, but this is challenging to get completely right. If unsure ask here first before you report a bug report that is just due to some version mix that will not appear this way in next Debian stable. Also in case a bug is clearly an upstream bug, you can help by also reporting it upstream and provide a link to the Debian bug report. Many thanks! Best, -- Martin