Version
4.7.0
Reproduction link
https://jsfiddle.net/kc7L9y6s/
Steps to reproduce
Just create a chart with a big enough legend to expand multiple lines. And add the set the legend -> selector option to true.
What is expected?
I was expecting the legend area to resize properly.
Here you can see a chart legend without the legend selector, that is working as expected.

What is actually happening?
The legend area is cropped on the left side because it is pushed by the legend selector. And the legend selector is cropped on the right side.
Here you can see a chart legend with the legend selector, with the responsiveness issue.
