Fetches the text from the label of the button, as set by
gtkButtonSetLabel. If the label text has not
been set the return value will be
NULL. This will be the
case if you create an empty button with
use as a container.
[character] The text of the label widget. This string is owned by the widget and must not be modified or freed.
Derived by RGtkGen from GTK+ documentation
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