At the moment copying text *from* the editor will change the topic validity state to "unknown".

This is because a keydown event that isn't a meta key or arrow is interpreted as a change to the text.

Two ways to fix this:

1. Intercepting Ctrl-C : http://stackoverflow.com/questions/2903991/how-to-detect-ctrlv-ctrlc-using-javascript

2. Change the event from a keydown to a "text change" event, if one exists.