Creates a new GtkWindow, which is a toplevel window that can
contain other widgets. Nearly always, the type of the window should
be GTK_WINDOW_TOPLEVEL. If you're implementing something like a
popup menu from scratch (which is a bad idea, just use GtkMenu),
you might use GTK_WINDOW_POPUP. GTK_WINDOW_POPUP is not for
dialogs, though in some other toolkits dialogs are called "popups".
In GTK+, GTK_WINDOW_POPUP means a pop-up menu or pop-up tooltip.
On X11, popup windows are not controlled by the window manager.
If you simply want an undecorated window (no window borders), use
gtk_window_set_decorated(), don't use GTK_WINDOW_POPUP.
Creates a new GtkWindow, which is a toplevel window that can contain other widgets. Nearly always, the type of the window should be GTK_WINDOW_TOPLEVEL. If you're implementing something like a popup menu from scratch (which is a bad idea, just use GtkMenu), you might use GTK_WINDOW_POPUP. GTK_WINDOW_POPUP is not for dialogs, though in some other toolkits dialogs are called "popups". In GTK+, GTK_WINDOW_POPUP means a pop-up menu or pop-up tooltip. On X11, popup windows are not controlled by the window manager. If you simply want an undecorated window (no window borders), use gtk_window_set_decorated(), don't use GTK_WINDOW_POPUP.