[Feature Request] Minimal diffs of comments and strings.

[Enoumy]

Hi! I love difftastic!

I have a feature request that I would like to submit a pull request for, but I wanted to first check in if this is something that would be generally useful first!

I would like "minimal diffs of comments and strings". For instance, take the following diff:

difftastic will color the entire string red/green and will bold the parts that changed. My feature request is to only color the parts that changed as green or red:

I totally understand that there may be use cases/situations for where the entire string should be colored red/green and only the parts that actually changed should be bolded/styled differently (e.g. whitespace changes in a string), which is why I was thinking that this change in behavior could be gated/opted into with a flag.

Please let me know if this sounds reasonable to you and I can send over a PR your way for review. Also curious on your thoughts on this.

Thanks!