Ability to add spell checking

[MarioFares]

The built-in WPF TextBox control enables spell checking but I have not found any way for AvalonEdit to allow this and there isn't a mention of this in the official documentation or issues raised.

I am hoping, if AvalonEdit relies on a TextBox control, to expose the spell checking capability or to add it in one way or another. Otherwise I can't seem to find a good way to implement this feature.

[DavidBerg-MSFT]

I don't know anything about the quality of the code, but there's this article on how to do it: https://www.codeproject.com/tips/560292/avalonedit-and-spell-check