D21909: [Colors KCM] Assign properties in a binding

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
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REVISION SUMMARY
  Save the previous value in a variable outside the binding and then assign the new ones to ensure it updates automatically.

TEST PLAN
  5.16
  
  - Changed colors to dark, filter icon on combobox turned white immediately

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D21909

AFFECTED FILES
  kcms/colors/package/contents/ui/main.qml

To: broulik, #plasma
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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