Clicking Off of a Blueprint Node Does Not Save Changes Made to Comment Bubble

When entering a comment on a Blueprint node, pressing Enter or clicking off of that node both appear to apply the changes made to the comment. However, clicking off of the node does not mark the Blueprint as dirty, and the changes to the comment are not saved upon closing and reopening that Blueprint.

Found in 4.10 binary. Reproduced in 4.9.2 binary and Main CL 2777621

1. Open the editor
2. Open any blueprint
3. Add a comment to the Event Begin Play node
4. Click off of the node without pressing Enter
5. Close the blueprint
6. Re-open the blueprint

Result: The comment you entered is no longer there, even though it appears to be saved when you click off of the node.

Expected: Clicking off of the node would either immediately reset the comment back to what it was before you began editing it, or it would save the changes you made and behave the same as pressing the Enter key.