gdk:window-stick (window)

window -- a toplevel gdk:window object

"Pins" a window such that it is on all workspaces and does not scroll with viewports, for window managers that have scrollable viewports. When using the gtk:window widget, the gtk:window-stick function may be more useful.

On the X11 platform, this function depends on window manager support, so may have no effect with many window managers. However, GDK will do the best it can to convince the window manager to stick the window. For window managers that do not support this operation, there is nothing you can do to force it to happen.