Issue Summary

Upon publish, line breaks are added automatically before and after A list/task containing @mention inside a table

Steps to Reproduce

1. Create a page.
2. Add a table to the new page.
3. Add list (bullet/numbered/task). Then mention a user 
4. Publish the page.

Expected Results

Both edit and view mode give the same result: no line break before and after the paragraph

Actual Results

In view mode, line breaks are automatically added before and after the paragraph.

Workaround

Edit the page. Use Source code editor to delete <p> before and after