gdkWindowSetTransientFor
Indicates to the window manager that window is a transient dialog
associated with the application window parent. This allows the
window manager to do things like center window on parent and
keep window above parent.
gdkWindowSetTransientFor(object, leader)
See gtkWindowSetTransientFor if you're using GtkWindow or
GtkDialog.
Derived by RGtkGen from GTK+ documentation
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