IE: checkbox in document picker doesn't update immediately

Issue reported by client.

Reproduction path:

• Log in on https://cms.demo.onehippo.com
• Edit the description of a document
• Select some text and insert an internal link
• Select an article to link to with the document picker
• Check the checkbox "open in new window"' and click "ok"

Expected: popup closes, link is inserted
Experienced: nothing happens. If you click the "ok" button a second time then it works.