Set if @window must be kept below other windows. If the
window was already below, then this function does nothing.
On X11, asks the window manager to keep @window below, if the window
manager supports this operation. Not all window managers support
this, and some deliberately ignore it or don’t have a concept of
“keep below”; so you can’t rely on the window being kept below.
But it will happen with most standard window managers,
and GDK makes a best effort to get it to happen.
Set if @window must be kept below other windows. If the window was already below, then this function does nothing.
On X11, asks the window manager to keep @window below, if the window manager supports this operation. Not all window managers support this, and some deliberately ignore it or don’t have a concept of “keep below”; so you can’t rely on the window being kept below. But it will happen with most standard window managers, and GDK makes a best effort to get it to happen.