Udo wrote
activated icons, as you can see here with the third, are still difficult to recognize.
It should display much clearer than the screenshot you posted in the forum.
It fails on contrast, often with an outline color:
#ffffff - White
#000000 - Black
#00ff7f - SpringGreen
https://webaim.org/resources/contrastchecker/?fcolor=00ff7f&bcolor=FFFFFF&api* {"ratio":"1.34","AA":"fail","AALarge":"fail","AAA":"fail","AAALarge":"fail"}
https://webaim.org/resources/contrastchecker/?fcolor=00ff7f&bcolor=0000&api* {"ratio":"15.6","AA":"pass","AALarge":"pass","AAA":"pass","AAALarge":"pass"}
There is more to icon design than a quick hack swapping black and white. The other colors (greys and light green) might need to be inverted and some of the icon graphics might need to be reworked to support automated changes. A few minor changes have already been committed to standardise some icon colors.
It is not really viable working on this in Windows with a light theme.