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Article #69

Re: Zero Width Joiner in ligatures

#69
From: Read_Roberts
Date: Thu, 15 Jan 2009 19:01
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Hi John;

An engineer from the InDesign team responded, and said that in Adobe InDesign, such ligatures would not work, and made an alternate suggestion:

      In InDesign specifically, we will strip the joiner before composition
      and therefore it won't be assigned a glyph or participate in the ligature
      substitution. This is how we handle zero-width spaces, joiner, discretionary
      hyphens, etc. <k, U+035F &#9676;&#863; COMBINING DOUBLE MACRON BELOW,
      h> is probably a much better choice and in fact is much more likely to
      work (assuming the font ligates all that) with vanilla layout engines.
      Look for "double diacritics" in the index of The Unicode Standard, 5.0
      for all the details.




See ' <http://www.unicode.org/versions/Unicode5.1.0/>".

Double diacritics are referenced on pages 113, 146, 255.
P 113 in Chapter 3 Conformance., section 3.11 Canonical Ordering Behavior.
P 146 in Chapter 4 Character Properties, section 4.12 Characters with Unusual Properties.
P 225 in Chapter 7 European Alphabetic Scripts, section 7.9 Combining Marks.

- Read Roberts
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From: Read_Roberts@adobeforums.com
Newsgroups: adobe.opentype.developers.fdk
Subject: Re: Zero Width Joiner in ligatures
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Date: Thu, 15 Jan 2009 11:01:07 -0800
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