Update: Handle more cases of combining characters following white space.

Update: Handle more cases of combining characters following white space.

The way UTF-8 combining characters works continues to give me a headache.
This is a pass at resolving the case, but the logic is unfortunate.
I have a strong feeling that there is a regression from this.

At this point I feel unit tests are necessary.

Perform the combining check after checking white space.
Make the code more flexible by not returning on any invalid character.
An invalid character cannot be a white space, so treat it as not a white space and continue.
The resulting code should be more robust.