Fix text field spell check causing exception on ** text

[hjiangsu]

Pull Request Description

This is a small PR which fixes the error described in #1464. As mentioned in the original issue, this is caused by Flutter's spell checking engine. For now, I've disabled spell checking until a fix is confirmed from upstream.

Additional Info:
This is the stack trace (the exception doesn't explicitly print out the stack trace in the console):

The issue most likely comes from final RegExp currentSpanTextRegexp = RegExp('\\b$currentSpanText\\b'); in flutter/lib/src/widgets/spell_check.dart.

Issue Being Fixed

Issue Number: #1464

Screenshots / Recordings

Checklist

• If a new package was added, did you ensure it uses an appropriate license and is actively maintained?
• Did you use localized strings (and added appropriate descriptions) where applicable?
• Did you add semanticLabels where applicable for accessibility?

[hjiangsu]

Update: I found the corresponding Flutter issue, which mentions that it should be fixed: flutter/flutter#136032

Not sure what version it was fixed, but should double check if this is an issue once we upgrade to Flutter 3.22

[micahmo]

Nice find and fix! We can merge this for now as long as we remember to revert it once the upstream fix is included (I know spellcheck is very important to folks!).

On that topic, is there any progress on #1372?

[hjiangsu]

On that topic, is there any progress on #1372?

Not yet, still waiting for packages to be updated! I also saw that flex_color_scheme isn't compatible with Flutter 3.22 either, so we'll have to wait until the next version of that as well (updated the description on #1372 already).