AlignmentView.getVisibleContigs() out by 1

AlignmentView.getVisibleContigs():
- returns the ranges of visible (not hidden) columns
- according to its javadoc, this should return [start, end] positions - inclusive
- in fact it returns [start1, end1, start2, end2, ..., startN, width] where the last (or only) range is [inclusive, exclusive], and other ranges are [inclusive, inclusive]
In the simple case (no hidden columns), the end position is 1 too large.