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.
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.