Verifies that inserting a paragraph before a space does not cause text after the insertion position to be deleted.

Before inserting paragraph:
| "
    "
| <p>
|   "Hello<#selection-caret> world"
| "


"

After inserting paragraph:
| "
    "
| <p>
|   "Hello"
| <p>
|   "<#selection-caret> world"
| "


"