Some windows are better left out of the layout. `komorebic toggle-float` takes
the window that has the focus out of its container into the floating windows of
the workspace, which komorebi gives no tile and does not move, and the other
windows share the work area; on a floating window it puts it back in a container
at the focused place.
A floating window is in the index of managed windows like any other, so its
events find it, and it is in the state as the workspace's `floating_windows`.
Where a floated window goes is the `toggle_float_placement` of the window
management behaviour: by default it stays where it is, since the spike's
centering of floated windows waited for a configuration file. Centering and
resizing to the floating aspect ratio come with it.
Opening windows floating (the float override and the float rules), the floating
layer and its own focus and move commands come later.
The vm-commands sweep floats a window and puts it back, and its health check
counts the floating windows.
