Loading data corrupts chart if previous transition is not finished

Hi,
I noticed nasty behavior if you quickly load new data without waiting for the end transition.
I have a couple of radio buttons in my project, that change the scope of chart, hence user can hit them quickly. It corrupts chart object meaning that any further loading of data does not correct it, but makes even worse. This is especially evident with grouped bar charts, please take a look at fiddle:
http://jsfiddle.net/e7ZbT/
Simple bar chart may get to inconsistent state if new data is loaded too quickly, but usually next load fix it, so it's not so critical. In contrast grouped charts cannot be corrected, unless refresh of the page.
Any suggestions are very welcome.

Start by reproducing the rapid data-load scenario from the linked JSFiddle, especially with grouped bar charts, and trace the chart loading and transition flow. The fix is done when repeated loads before a transition finishes leave both grouped and simple bar charts consistent and usable for later loads.

Written by the indexing model from the issue text.