I think this should be ``insertTextSpec.position < setParagraphStyleSpec.position``. E.g., If the paragraph start is at position 4, inserting text at position 4 doesn't move the paragraph start.
```<p>|a|b|c|</p><p>|d|e|f|</p>```
after inserting text @ position 4 becomes:
```<p>|a|b|c|</p><p>|*X*|d|e|f|</p>```