Use disabled text colors also for inherit-ing Theme instances

Marco Martinrequested to merge
work/mart/properdisable into master
  • a Theme instance has its own set of colors if it does not inherit
  • the set of color of disabled stuff should be different from enabled
  • if a non inherit one is disabled, it will take colors from the parents that are not disabled

Change to behave as non inherit when the quickitem of this theme is disabled and colorGroup is not Disabled

BUG:433256

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