[Web] Spell check indicators are at wrong position on FireFox

[NicolasDionB]

My issue is about [Web], I noticed that on FireFox, the spell check indicators (red waves under the text) is misplaced, not following the actual position of the content in my editor widget.

I used the example provided in source to show this:

I'm using Flutter 2.8.1 with Quill Editor 3.7.3, running on FireFox 96.0.2 (64 bits) on Windows 10.

[NicolasDionB]

@singerdmx Why was the issue converted to a discussion? It's clearly a bug to me. This doesn't happen on Chrome for instance. Maybe I'm missing something.