Model description goes over the edge

[Ohems]

Swagger version 3.0.21
Browser: Chrome 60.0.3112.78 (64-bit)

With a certain window width, this...

info:
  title: Example
  version: 1.0.0
swagger: '2.0'
definitions:
  Object:
    type: object
    description: >
        a a a a a a a a a a a a a a a a a a a aaaaa a a a a a  a aa 
    properties:
      child:
        type: object
        description: >
            This here is also a pretty long description, but..
            Well, see for yourselves. If you're using Chrome,
            that is.
paths:
  '/endpoint':
    get:
      responses:
        '200':
          description: OK
          schema:
            $ref: "#/definitions/Object"

...looks like this:

Possibly related to #3474

Each child indentation layer seems to go further and further out of bounds.