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It's a Mate thing as far as I can tell. I set up a VM with Ubuntu Mate 24.04.2 and I'm seeing the same thing. No color in the list widget indicating single (or multiple selections). Hoping to rule out the AppImage, I installed the necessary system Python pieces and had the AppImage use the system Python. The results were the same. So I installed the version of Sigil that Ubuntu had in its repos and tried that. Again the the same.
So with a bit of Python code, I dumped what the default colors were for the tkinter list box, and sure enough, the background color and the selectbackgroundcolor are identical. That's why you can't see what's highlighted in the widget. What I don't know is 1) how Mate is forcing this tkinter theming, and 2) how/why the AppImage's bundled Python and tkinter are picking up on it.
I can manually override the colors in my plugin easily enough, but that's an ugly solution.
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