UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/601.5.17 (KHTML, like Gecko) Version/9.1 Safari/601.5.17

Steps to reproduce the problem:
1. Create and open an HTML file with the following content: <div contenteditable="true" style="width:400px; height:200px; outline:1px solid red;"><br>text</div>
2. Click on the line above "text"
3. Start typing garbage
4. Chrome won't underline.

What is the expected behavior?
The spell checker should trigger and underline the word.

What went wrong?
The spell checker didn't trigger. Adding a third line makes the spell checker work (for any following text). Modifying the second line makes the spell checker scan the previous line.

Did this work before? Yes Works fine in 48.0.2564.97, but broken in 50.0.2661.94 and 51.0.2704.36.

Chrome version: 51.0.2704.36  Channel: beta
OS Version: OS X 10.11.4
Flash Version: