Using the new 2.3 Assignment, there is no way to view the entirety of an online text submission without first downloading all submissions to a zip file.
Steps to reproduce:
1. Create a new 2.3 Assignment, setting it to allow Online Text.
2. As a student, submit an entry of more than 20 or 25 words to this assignment. I used 5 paragraphs from Bacon Ipsum.
3. As an instructor, navigate to the assignment and go into the grading view for the above submission.

Expected: Should be able to see the entire submission, either in the grading view, or in an additional pop-up window.
Actual Result: There is no method for viewing the entire submission in Moodle.