Resize bubbles of bubble chart along with chart area

Stefano Ricchiuti

Currently, when selecting a block for the "radius" property of a bubble chart, the bubbles' size stays fixed and does not change when resizing the chart area.
This can cause the bubbles to overflow the chart area like in the image below.  
If there were to be a "bubbles scale multiplier" one could adjust the bubbles' size relative to the chart area, so to prevent overflowing.