Exercises G25

Description:
I have found an issue with the spelling error detection feature.

Steps to Reproduce:

1.Launch the desktop app.
2.Observe the initial settings, with "word suggestions" and "spelling error" options checked by default.
3.Uncheck the "word suggestions" option.
4.Leave the "spelling error" option checked.
5.Start typing some words with intentional spelling mistakes.

Expected:

When typing words with spelling mistakes,the app should detect the errors and display a red underline or provide a warning indicating the incorrect spelling.

Actual:

1.The app does not provide any warning or display a red underline for incorrectly spelled words,
even when the "spelling error" option is checked in the settings.
And the spelling error detection feature is not functioning as expected.

Environment:

1.Firefox 117.0 (64-bit)