void gtk_window_resize ( GtkWindow* window, gint width, gint height )
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
gtk_widget_set_size_request() to set the window’s
request to a smaller value.
gtk_window_resize() is called before showing a window for the
first time, it overrides any default size set with gtk_window_set_default_size().
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
gtk_window_resize() is issued.
If the GtkWindow has a titlebar widget (see gtk_window_set_titlebar()), then
gtk_window_resize() will compensate for the height of the titlebar
widget only if the height is known when the resulting GtkWindow configuration
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
gtk_window_resize() and not
a larger window.