Former ideas for implementing the floating of single windows in herbstluftwm. But now it doesn't need to be implemented directly because auf the possibility to control the monitor stacking order. The former ideas were: * When toggling the floating-property of a window doesn't change the position in the binary tree. * In a frame, no space is wasted for the "tiled" rectangle (i.e. position and size) of a floating window. * When navigating through the binary tree via the focus command all floating windows are skipped. So they only can be focused by mouse or with the cycle_all or cycle. * When shift'ing a floating window, then the layout tree changes (i.e. the output of layout or dump), but window rectangles (positions and sizes) don't change * Configurable: Either let all floating windows float above tiled windows or allow them to be between/behind tiled windows. * Something like: Switch focus between floating and tiling layer.