Layer-group preview-update blocks UI when adding/removing layers
GIMP 2.10.18, on both Windows and Linux.
- Open a middle-to-large image, e.g. 3600×2400px
- Duplicate the layer a few times
- Create a layer group
- Start dragging layers into that group
- Once you drop a layer there, all of the contents of the Layers palette disappears for a few seconds to update
Disabling layer groups preview "fixes" it.