highslide-software/highcharts.com — pull request #1317 by sappling (2012-10-16 16:18:34+00:00)
Title: Fixes for clipping regions with multiple Y axes.  Also fixes inverted graphs with Axis.left specified.

Please see http://jsfiddle.net/sappling/UGK5d/ for a demonstration of the general problem with clipping and multiple y Axes.
See http://jsfiddle.net/sappling/aFPcp/ for demonstration of the problem with an inverted graph with multiple y Axes. Note that the inverted version doesn't just have a clipping problem, it doesn't honor the Axis.left option either.
I believe that this fix handles both of these issues.

This may need some more work in one area. I was not exactly clear of the purpose of the sharedClipKey during animation. I have not done anything similar for these new clip regions. If you can help me understand this, I'll be glad to try to update the per-axis clipping regions similarly if needed.