void gtk_window_iconify ( GtkWindow* window )
Asks to iconify (i.e. minimize) the specified
window. Note that
you shouldn’t assume the window is definitely iconified afterward,
because other entities (e.g. the user or
[window manager][gtk-X11-arch]) could deiconify it
again, or there may not be a window manager in which case
iconification isn’t possible, etc. But normally the window will end
up iconified. Just don’t write code that crashes if not.
It’s permitted to call this function before showing a window, in which case the window will be iconified before it ever appears onscreen.
You can track iconification via the “window-state-event” signal