c_gdk_x11_window_set_hide_titlebar_when_maximized

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GdkWindow* window, int hideTitlebarWhenMaximized) c_gdk_x11_window_set_hide_titlebar_when_maximized;

Meta