SUMMARY It used to work, but doesn't anymore. Sorry if that's intentional. git 5344156 STEPS TO REPRODUCE 1. Try to apply transform tool to a Group Layer with some paint layers in it. OBSERVED RESULT Krita says "Unable to transform the layer". EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: Windown 7 macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION Doesn't work on both cases when Recursive Transform is on/off.
I cannot reproduce this on 22336d99407a39efccff19e9ca57fcb5b2dce80b can reproduce in 9429230. Might be a result of 630ce8583cb5a9337aceb2ca96f17c2cf1df306e Scott was looking into this due a different patch he wanted to push so I'll assign him. Otherwise, it ought to go to Agata or Dmitry.
This was a recent bug that was introduced a week ago. The bug affects more than just group layers. I am working on a patch to fix this...as well as add some functionality to the transform tool. The work is being done here... https://phabricator.kde.org/D18792
This is fixed. Group layers should allow you to transform again if you check the next nightly build...or wait for Krita 4.2 to come out.