SpellChecker sample no longer works in Visual Studio 2022

[RichieHindle]

The SpellChecker sample no longer works in Visual Studio 2022 (17.11.5 at the time of writing).

In DoUpdate(), the call to _classifier.GetClassificationSpans() always returns an empty collection, so no comments are found.

I publish a commercial Visual Studio extension that uses similar code, and that no longer works either. How can this code be modified to work with the current VS 2022? Thanks!

[RichieHindle]

Notes:

• To get the sample to load into VS2022, you need to change the version numbers in the manifest from [...,16...) to [..., 18...).
• There's an error when you build the extension, but you still get a valid VSIX file that successfully installs.