xdg-toplevel-drag Wayland protocol approved

"This protocol allows applications to request that a window is moved
at the same time as a drag operation - effectively dragging windows.
With this features such as detaching a tab from a window and reattaching
it, dragging tabs between windows or (un)dockable tool windows can
be implemented."

Videos of KWin and QT:

topleveldrag

qtworking

Chrome in KWin