When sharing an issue in JIRA ondemand-fireball-216-11-gffe2c38, scrolling to the bottom of the share dialog causes it to dissapear, losing content

When sharing an issue in JIRA ondemand-fireball-216-11-gffe2c38, scrolling to the bottom of the share dialog causes it to dissapear, losing content

To reproduce:

1. Open https://sdog.jira.com/browse/JSTDEV-2666
2. Click the "share" button
3. Enter some large-ish (say, three paragraphs) text and some people
4. Scroll to the bottom of the share content pane, watch the floating share dialog dissapear, along with all your content.
5. Scream, loudly.