Using issue template overwrites bug description

Summary

(Summarize the bug encountered concisely)

Steps to reproduce

1. Go to https://gitlab.com/gitlab-org/gitlab-ce/issues/new?issue%5Bassignee_id%5D=&issue%5Bmilestone_id%5D= , which will have a default template in the Description box
2. Remove text in the Description box, and write something in the Description box, ideally pouring hours into the perfect bug description
3. Select "Bug" in the Template dropdown
4. Cry as the Description field is overwritten with a template
5. Try to rescue the user authored text, using undo, etc
6. Cry some more

What is the current bug behavior?

The user-author text is replaced with a template

What is the expected correct behavior?

I would at least like a warning to say that my text is going to be destroyed. But a better UX might be to append the template after the custom text.