pangoItemize, but the base direction to use when
computing bidirectional levels (see pangoContextSetBaseDir),
is specified explicitly rather than gotten from the PangoContext.pangoItemizeWithBaseDir(context, base.dir, text, start.index,  length, attrs, cached.iter = NULL)contextPangoContext]    a structure holding information that affects
	       the itemization process.base.dirPangoDirection]   base direction to use for bidirectional processingtextstart.indextext to processlengthstart.index.
            This must be >= 0.attrsPangoAttrList]      the set of attributes that apply to text.cached.iterPangoAttrIterator]       Cached attribute iterator, or NULLlist of PangoItem structures.