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I'm unsure whether to underline text or how to do so efficiently. Visually, I don't see much difference between underlining and leaving it plain.
NOTE: I'd set the AvaloniaSampleVersion to 11.3.6 for getting this fix AvaloniaUI/Avalonia#18759
Fixes #524


Achieving Chromium's effect where pre-edited text compresses subsequent content would likely incur performance overhead.
Therefore, I've implemented the same effect as Visual Studio.