On Ubuntu Unity - Krita 4.1.0-pre-alpha (git dac4dc7) Steps: 1) Add a "Transparency Mask" to the lowest layer you want to group 2) click the topmost layer in the docker 3) SHIFT + click the T. Mask 4) CTRL + G Actual Results: nothing happens. Expected Results: group layers.
I can confirm this: what happens is that Krita sees that the current node is a mask, and thinks that the group layer action cannot be performed. If you'd select the mask, then shift select to the top layer, the action works.
Git commit ae410a3ddc36ccbe8d28880176ec39827ede48a0 by Boudewijn Rempt. Committed on 05/06/2018 at 08:13. Pushed by rempt into branch 'krita/4.0'. Allow creating a group if the current node is a mask M +1 -1 krita/krita.action M +1 -2 libs/image/kis_layer_utils.cpp https://commits.kde.org/krita/ae410a3ddc36ccbe8d28880176ec39827ede48a0
Git commit 6d769df9fec56f5f7c78d43fbb4444b2d9742027 by Boudewijn Rempt. Committed on 05/06/2018 at 08:13. Pushed by rempt into branch 'master'. Allow creating a group if the current node is a mask (cherry picked from commit ae410a3ddc36ccbe8d28880176ec39827ede48a0) M +1 -1 krita/krita.action M +1 -2 libs/image/kis_layer_utils.cpp https://commits.kde.org/krita/6d769df9fec56f5f7c78d43fbb4444b2d9742027