Bikeshed update for 'Update definition of scrollSource to allow it to be null (#34)

This should fix #11, #12, and #13.
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commit bf1a16b
Author: Stephen McGruer <stephen.mcgruer@gmail.com>
Date:   Mon Nov 26 10:23:54 2018 -0500

    Update definition of scrollSource to allow it to be null (#34)

    This should fix #11, #12, and #13.

Author: stephenmcgruer