X-ticks displayed outside of actual chart area during zoom

you can see the behaviour in the zoom example. http://c3js.org/samples/interaction_zoom.html

When you zoom in a little bit and then drag the series around, you can see, that the labels appear already on the left side of the y-axis and not, how expected, directly beneath the y-axis.

Reproduce the problem in the interaction zoom example by zooming slightly and dragging the series. Observe when x-axis labels appear left of the y-axis, then trace the zoom and axis-rendering entry points in the chart library. Done means labels remain directly beneath the y-axis while the zoomed series is dragged.

Written by the indexing model from the issue text.