Display whitespace in diff using visible characters

[honzajavorek]

Coming from a suggestion on API Blueprint Slack channel:

...
As the display for dredd doens't actually show which whitespace is from the parser, and which is formatting from dredd, it's... not easy to catch.
You can wrap it with a hook, which I'll do for the tests, but I'm going to suggest a - whitespace option to display \n, \t, \s or similar for 'eyeball' tests.

So according to the suggestion, dredd's output would use some visible notation for various forms of whitespace so one could easily see the difference in case the only mismatch is in type of whitespace or X spaces vs. tab, etc.

[HowardSterling]

I'm the person who had the confusion/issue - if anyone needs further clarification.

• I might suggest \n, \t, and similar 'eyeballing' strings for text output.

[netmilk]

Totally +1 for this!