Pre-allocate buffers when adding string
We do a conservative estimate of the number of characters, but still, this limits the number of buffer reallocs to a small constant.
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@ -723,6 +723,7 @@ hb_buffer_guess_properties (hb_buffer_t *buffer)
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} \
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if (item_length == -1) \
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item_length = text_length - item_offset; \
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buffer->ensure (buffer->len + item_length * sizeof (T) / 4); \
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const T *next = (const T *) text + item_offset; \
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const T *end = next + item_length; \
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while (next < end) { \
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