Sets the base direction for the context.
The base direction is used in applying the Unicode bidirectional algorithm; if the direction
is
pango_direction_ltr or pango_direction_rtl, then the value will be used as the paragraph
direction in the Unicode bidirectional algorithm. A value of pango_direction_weak_ltr or
pango_direction_weak_rtl is used only for paragraphs that do not contain any strong characters
themselves.
this |
a `PangoContext` |
direction |
the new base direction |