Allow controlling the screen contrast in addition to its brightness

Hi!

I just noticed the new brightness control for external screens in Plasma. That’s neat!

I usually set contrast and brightness at the same levels, so a control that only allows setting the brightness is of limited use for me.

It would be nice to either:

  1. have an option to make the slider also change the contrast
  2. have a second slider for the contrast

I prefer 1, and 2 is more powerful, so the option could offer the following:

  1. only change the brightness
  2. only change the contrast
  3. change both the brightness and the contrast
  4. show separate sliders for brightness and contrast

(the usefulness of 2 would be unclear to me though)

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