gdk:window-constrain-size (geometry flags width height)

geometry -- a gdk:geometry instance
flags -- a gdk:window-hints mask indicating what portions of geometry are set
width -- an integer for the desired width of the window
height -- an integer for the desired height of the window

new-width -- an integer for the resulting width
new-height -- an integer for the resulting height

Constrains a desired width and height according to a set of geometry hints such as minimum and maximum size.