It’s almost comical, every solution having a negative side effect! 
Darktable never get’s boring. 
Actually the best solution is that from Rawfiners video…he suggest that you start with the lens corrections module and check TCA override… doing that and making a very small correction to the blue does a nice job…you can also drop the radius way down when using CA module if you get that sort of thing… I wasn’t pixel peeping in those areas that @apostel338 picked up…
The good thing is I think is that a set of kit will likely start to reveal predictable traits in your images so that once you nail the fix and set in your workflow you wont have to worry as much about it…
Is the lens used in lensfun? If not creating a profile isn’t that hard and would likely correct this issue.
Just a note, the raw CA module doesn’t work correctly if only a small part of the image is visible in darkroom.
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Is 100% fine ??
Seems like it depends on screen resolution. I just fired up an old PlayRAW-image to test. Monitor is 3440x1440, and with darktable in windowed mode as it came up, filling the monitor height, I got this at 100%:
When changing to full screen the message disappeared.
Is 100% fine ??
Nope. You should ideally not zoom at all. Maybe I’ll fix that…
I short, the ca correction works the better-the more data. Requires heavy work on roi though.
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NP on my end I don’t use it 
…
That would be a great fix as to often see the CA we need to be zoomed in. I Hope you find time to fix it. Thanks for your efforts.
Terry have you tried to do it from lens corrections… it can be pretty respectable precursor to ca module
I will keep this in mind. Thanks
It was actually the suggested first step I believe by Rawfiner in his video…