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Low-level text helper utilities.
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Render *string* with *font*.
For each character in *string*, yield a LayoutItem instance. When such an instance
is yielded, the font's glyph is set to the corresponding character.
Parameters
----------
string : str
The string to be rendered.
font : FT2Font
The font.
features : tuple of str, optional
The font features to apply to the text.
language : str, optional
The language of the text in a format accepted by libraqm, namely `a BCP47
language code `_.
Yields
------
LayoutItem
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