Determines if the given region is a comment region commented by this strategy.
@param document {@link IStructuredDocument} containing the givenregion
@param region determine if this region is a comment region commented by this strategy
@return true if the given region has already beencommented by this strategy, false otherwise
@throws BadLocationException it is not the fault of the strategy if callers passes a badoffset and/or length for the given model
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