Use KisUniqueColorSet for the saved color history, implement in wide gamut selector.

Wolthera van Hövellrequested to merge
woltherav/krita:port-color-history-to-unique-colorset into master

Part of #88

This replaces the QList with KisUniqueColorSet and connects up the wide gamut selector with the globally saved

TODO:

  • Implement 'store colors in document' for the wide gamut selector.
  • I am unhappy that there's now a qobject in the canvas resources, I am worried it'll leak.
  • For some reason the color history needs to be cleared first before it works. I don't know what causes this, my suspicion is a config option somewhere is storing too much data, but I don't know where.
Edited by Wolthera van Hövell

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