Returns the baseline that has currently been allocated to @widget.
This function is intended to be used when implementing handlers
for the #GtkWidget::draw function, and when allocating child
widgets in #GtkWidget::size_allocate.
Return: the baseline of the @widget, or -1 if none
Returns the baseline that has currently been allocated to @widget. This function is intended to be used when implementing handlers for the #GtkWidget::draw function, and when allocating child widgets in #GtkWidget::size_allocate.
Return: the baseline of the @widget, or -1 if none