In phpMyAdmin 4.1.0 and 4.2.0-dev while creating a table, when you add more columns and click "Go", the columns are added but all previously entered data on the form disappear and you need to enter them again.
yes, just I wanted to report. :-)
All fields empty after adding a new one...
I have submitted a pull request to fix this. https://github.com/phpmyadmin/phpmyadmin/pull/787 . Please review and let me know if that'll work.
Fix accepted, thanks.