What's up with these Unicode combining characters and how can we filter them?

Question

กิิิิิิิิิิิิิิิิิิิิ ก้้้้้้้้้้้้้้้้้้้้ ก็็็็็็็็็็็็็็็็็็็็ ก็็็็็็็็็็็็็็็็็็็็ กิิิิิิิิิิิิิิิิิิิิ ก้้้้้้้้้้้้้้้้้้้้ ก็็็็็็็็็็็็็็็็็็็็ กิิิิิิิิิิิิิิิิิิ

Answer 1

"How can we sanitize this" is best answered above by T.J Crowder

However, I think sanitization is the wrong approach, and Cristy has it right with overflow:hidden on the css containing element.

At least, that's how I'm solving it.