One buffer can be shared among many widgets. buffer may be null
to create a default buffer, in which case this function is equivalent
to gtk.text_view.TextView.new_. The text view adds its own reference count
to the buffer; it does not take over an existing reference.
Creates a new gtk.text_view.TextView widget displaying the buffer buffer.
One buffer can be shared among many widgets. buffer may be null to create a default buffer, in which case this function is equivalent to gtk.text_view.TextView.new_. The text view adds its own reference count to the buffer; it does not take over an existing reference.