Gets a
PangoContext with the appropriate font description and
base direction for this widget. Unlike the context returned by
widgetCreatePangoContext, this context is owned by the widget
(it can be used until the screen for the widget changes or the widget
is removed from its toplevel), and will be updated to match any
changes to the widget's attributes.
If you create and keep a
PangoLayout using this context, you
must deal with changes to the context by calling
layoutContextChanged on the layout in response to the
onStyleChanged and
onDirectionChanged signals for the
widget.