Previous (and still included) Workspace, Transcript and Nautilus provide Window grouping by selecting "Create window group" from the window menu and then dragging two windows onto each other. They are grouped together in one single window then and each one gets a tab.
Looks like Playground does not support this feature yet - so currently I end up with many many windows which for me is a step backwards compared to working with workspaces in Pharo 3.0
What is necessary to provide this for the Playground so we have a common behavior for all the tools and a cleaner desktop?