Usermanual, fix up userfeatures example code in OpenType features section of shaping chapter.
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@ -167,13 +167,20 @@
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"discretionary" ligatures in the font:
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</para>
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<programlisting language="C">
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unsigned int num_features = 1;
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hb_feature_t userfeatures[num_features];
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hb_feature_t userfeatures[1];
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userfeatures[0].tag = HB_TAG('d','l','i','g');
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userfeatures[0].value = 1;
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userfeatures[0].start = 0;
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userfeatures[0].end = (unsigned int) -1;
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userfeatures[0].start = HB_FEATURE_GLOBAL_START;
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userfeatures[0].end = HB_FEATURE_GLOBAL_END;
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</programlisting>
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<para>
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<literal>HB_FEATURE_GLOBAL_END</literal> and
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<literal>HB_FEATURE_GLOBAL_END</literal> are macros we can use
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to indicate that the features will be applied to the entire
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buffer. We could also have used a literal <literal>0</literal>
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for the start and a <literal>-1</literal> to indicate the end of
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the buffer (or have selected other start and end positions, if needed).
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</para>
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<para>
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When we pass the <varname>userfeatures</varname> array to
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<function>hb_shape()</function>, any discretionary ligature
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