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@zufuliu suggested adding support for the classes definition syntax in the discussion of PR #70. This PR contains a proposed solution.
It works fine with the correct syntax but employs a little hack: it doesn't recognize function scopes to avoid storing too much data in the line state integer. Instead, it just considers everything within a folding level beyond the 2nd to be a function's scope. This consideration may lead to the erroneous neglect of some keywords (there's an example in the proposed test). However, such a problem can occur only in a file with invalid syntax, so I think it's not really an issue.