fix: prevent unexpected spy callback removal on multiple unmount calls #519
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Problem:
Multiple scrollSpy.unmount() calls may occur on same Link due to component tree rebuild. Subsequent calls will try to remove already non-existing spyHandler. In this case .indexOf(spyHandler) will return -1 and .splice(-1, 1) will cause unwanted removal of last spyHandler in list.
Same with setState handlers.
Solution
Add extra check to make sure spyHandler and setState are in lists