Subchart + modifying axes causes lines to overflow x-range

Note the line crossing over the right side of the x-axis. This occurs when zooming in using a subchart, and updating the y-axis min and max via the chart API's.

Start by reproducing the issue with a subchart zoom followed by chart API updates to the y-axis minimum and maximum. Trace the axis and x-range handling around that sequence; done means the line no longer crosses beyond the right side of the x-axis.

Written by the indexing model from the issue text.