The EvaluationUnmatchedStyle option of PrivateCellOptions was introduced in v10, wherein any time input is changed, the corresponding output dims to signify that output is no longer consistent with input. An old thread on this topic: Faded output is printed from dynamic object
While playing around with cell background colors, I found that if some really output cell background color with certain opacity is chosen, the dimming breaks.
Consistent Input and Output :
Inconsistent Input and Output :
Is there any way to control the dimming level manually? Is there any value one can pass to EvaluationUnmatchedStyle that is not the buggy EvaluationUnmatched?
You can reproduce this behavior with this example setting: Background->RGBColor[ 0.388235,0.933333,0.388235, 0.1]
Possible implementation of EvaluationUnmatchedStyle :
I think I understand how the EvaluationUnmatched value of EvaluationUnmatchedStyle is being implemented.
myEvaluationUnmatched = {PrivateCellOptions -> {"ContentsOpacity" ->.5}}
CurrentValue[$FrontEnd, {PrivateCellOptions,"EvaluationUnmatchedStyle"}] = myEvaluationUnmatched
To my eyes the effect of this identical to the default one
CurrentValue[$FrontEnd, {PrivateCellOptions,"EvaluationUnmatchedStyle"}] = "EvaluationUnmatched"
This means the real issue is with the implementation of ContentsOpacity.
Addendum:
The issue is ContentsOpacity doesn't play nice with RGB color that comes with it's own opacity i.e. RGBColor[r,g,b,a]. My background color had some opacity of its own, and dropping that makes everything work fine.
However, I would still be curious to know if ContentsOpacity can be made to work on background colors with predefined opacity.
