Comment 2 for bug 83553

Nothing to do with ubuntu-meta - not really anything specifically to do with meta-kde either except that the KDE packages are pretty big and monolithic and so run into this aspect of the structure of the packaging system a lot.

It definitely wouldn't have upgraded all of KDE, just all the binaries from the source package kdebase. Upgrades happen at the granularity of source packages, because that's what developers upload.