Сomment replaced with issue description

Сomment replaced with issue description http://take.ms/5zFUI

Some time, with checkbox replaced with ticket description and its gone forever.

Possible steps to reproduce

• Create a comment on issue with checkboxes
• Duplicate tab with the same issue
• Start writing a new comment (in a tab 2)
• Check some marks (in a tab 1)
• Submit a comment (in a tab 2)

Such case is legit, during regression testing. Its easier to submit comment with new issues and check whats done in a separate ticket

History Feature under a separate button

• Would be great to have some History on ticket, like who did the changes, what was changed and when.