Fallbacks (at least the range I tested) do not work with the roman face of Linux Libertine O in the new (core) simplefonts implementation. I first thought that this might be a Libertine issue, but further testing makes me suspect it may be a simplefonts issue. Or perhaps I have used the wrong syntax with the new implementation.

Below are two MWEs, one based on the current standalone (current version: 2013.11.16 12:43), running on Windows 8.1 with the win64 bins, and the second based on an up-to-date TL13 (ConTeXt ver: 2013.05.28 00:36 MKIV) on the same system. Linux Libertine O is version

When I run the standalone version, the fallback characters do not appear between the first angles, but do appear between the bf and it angles. They appear between angles in all cases with the TL13 MWE.

I do not see the problem with my home-grown typescript for Libertine under either TL13 or the current standalone.

I do not see the problem with Junicode, Gentium Book Basic, or Gentium Basic. I have not yet tried other fonts.

Standalone MWE:

  \definefallbackfamily [libertine] [serif] [Gentium Plus]
                                    [range={0x02052-0x02058},force=yes]
  \definefontfamily     [libertine] [serif] [Linux Libertine O]
  \setupbodyfont        [libertine]
  \def\SDQP{⁓⁗}%   Swung Dash Quad Prime U02053U02057

  \starttext
  >\SDQP<

  >{\bf \SDQP}<

  >{\it \SDQP}<

  >{\bf{\it \SDQP}}<
  \stoptext


TL13 MWE:

  \setupbodyfontenvironment [default][em=italic]
  \usemodule                [simplefonts]
  \setmainfontfallback      [Gentium Plus]
                            [range={0x02052-0x02058},force=yes]
  \setmainfont              [Linux Libertine O]
  \def\SDQP{⁓⁗}%   Swung Dash Quad Prime U02053U02057

  \starttext
  >\SDQP<

  >{\bf \SDQP}<

  >{\it \SDQP}<

  >{\bf{\it \SDQP}}<
  \stoptext

--
Rik Kabel

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