Make whitespace visible by default on diff

**Is your feature request related to a problem? Please describe.**
I feel that it is unlikely that people know that the option is there, and instead assume that there are no extra whitespaces in their data.

**Describe the solution you'd like**
Opposite default of whitespace visibility.

**Describe alternatives you've considered**
Don't think it applies

**Additional context**
Add any other context or screenshots about the feature request here.