[HarfBuzz] harfbuzz: Changes to 'cross-kern'

[Behdad Esfahbod]

New branch 'cross-kern' available with the following commits:
commit 215587a5d1f707d1dffa7b08224cd56bb8dfdb56
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Nov 6 17:16:04 2018 -0500

    [kern] XXX Negate CrossKerning sign
    
    Not sure why, but seems to better match GeezaPro Arabic w CoreText.
    
    Quite possibly I'm doing something very wrong...

commit 57689a32f9b66978ba72a0d47dee075fa92d6c91
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Nov 6 13:59:28 2018 -0500

    XXX

commit 01bf43ac01576a6415336cc56c74bb1a872566d1
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Nov 6 14:48:42 2018 -0500

    [kern] Implement CrossStream kerning

commit b11830c09e0d78bbdaf86ef02191d00b3d8256c4
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Nov 6 15:23:18 2018 -0500

    [kern] Improve Format 2
    
    Still disabled.

commit c0383c6bb725bed2a48485988a427348384f3f87
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Nov 6 15:07:19 2018 -0500

    Minor

commit 10e6f708f30986bab9f7b506935f2555d6b79ff4
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Nov 6 13:32:13 2018 -0500

    [kern] Minor

commit 164eedd9181345d84d5f8059475ad4b97784fd46
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Nov 6 13:18:27 2018 -0500

    [kern] Minor

commit 220a5991baa213b7bd173ea02090dc6fc8aef655
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Nov 6 13:51:39 2018 -0500

    [kern/kerx] Fix trace numbering