I've been using a dark theme on my windows for a long time and today I tried for the first time the editor. It didn't work that well as I can't see the preview/results.
See image (I can't see the text because it's on a dark background from the windows theme):
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This is how it could be fixed (it's something I've edited fast in paint.net, so it's a concept/mockup) (so I guess it's a bug / feature request):
Thank you!