Resizes the window as if the user had done so, obeying geometry constraints. The default geometry constraint is that windows may not be smaller than their size request; to override this constraint, call Widget.setSizeRequest to set the window's request to a smaller value.
Windows may not be resized smaller than 1 by 1 pixels.
When using client side decorations, GTK+ will do its best to adjust the given size so that the resulting window size matches the requested size without the title bar, borders and shadows added for the client side decorations, but there is no guarantee that the result will be totally accurate because these widgets added for client side decorations depend on the theme and may not be realized or visible at the time Window.resize is issued.
If the GtkWindow has a titlebar widget (see Window.setTitlebar), then typically, Window.resize will compensate for the height of the titlebar widget only if the height is known when the resulting GtkWindow configuration is issued. For example, if new widgets are added after the GtkWindow configuration and cause the titlebar widget to grow in height, this will result in a window content smaller that specified by Window.resize and not a larger window.