GdkX11.X11Window.prototype.set_frame_extents

function set_frame_extents(left: Number(gint), right: Number(gint), top: Number(gint), bottom: Number(gint)): void {
    // Gjs wrapper for gdk_x11_window_set_frame_extents()
}

This is the same as gdk_window_set_shadow_width() but it only works on GdkX11Window.

Since 3.10

left: The left extent
right: The right extent
top: The top extent
bottom: The bottom extent