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Hi John;<br /><br />An engineer from the InDesign team responded, and said that in Adobe InDesign, such ligatures would not work, and made an alternate suggestion:<br /><br />> In InDesign specifically, we will strip the joiner before composition and <br />> therefore it won't be assigned a glyph or participate in the ligature <br />> substitution. This is how we handle zero-width spaces, joiner, discretionary <br />> hyphens, etc. <br />> <k, U+035F ◌͟ COMBINING DOUBLE MACRON BELOW, h> is probably a much <br />> better choice and in fact is much more likely to work (assuming the font <br />> ligates all that) with vanilla layout engines. Look for "double <br />> diacritics" in the index of The Unicode Standard, 5.0 for all the details.<br /><br />See ' http://www.unicode.org/versions/Unicode5.1.0/".<br /><br />Double diacritics are referenced on pages 113, 146, 255.<br />P 113 in Chapter 3 Conformance., section 3.11 Canonical Ordering Behavior.<br />P 146 in Chapter 4 Character Properties, section 4.12 Characters with Unusual Properties.<br />P 225 in Chapter 7 European Alphabetic Scripts, section 7.9 Combining Marks.<br /><br />- Read Roberts
This is extremely helpful -- it explains why things weren't working, and gives a much better approach. I've tried it, and it works. Thanks from a very satisfied customer.