Problem adding more than 1 element to the shortcode class="" option.

Hello,

In the Shortcode docs under the optional attributes, there is a line that reads,

class – Additional CSS classes to use for further styling.

Adding more than one results in them all being combined (spaces are removed). For example:

[course_action_links label="" class="btn btn-lg btn-success"]

The above results in the following:

class="apply-links course-action-links course-action-links-1533 btnbtn-lgbtn-success"

What is the correct way to add more than 1 class to the line.

Thanks