UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

Steps to reproduce the problem:
1. Create an element with a shadow dom
2. In the shadow dom, create an element with contenteditable
3. Select all text in the contenteditable element
4. Execute "insertunorderedlist" (a couple of times)

In the supplied test case the first text is without shadow dom, while the second text is within shadow dom.

What is the expected behavior?
The behavior is the same as in the non-shadow dom version, it create 3 bullet points for each line or removes all bullet points from all lines.

What went wrong?
Instead it first creates a bullet point for the first and third line. Executing again creates bullet points for all lines. Executing again removes the bullet point for first and third, but keeps it on the second line. Then it alternates between the last two states.

Note that there are also a lot of empty text nodes inserted in the dom.

Did this work before? No 

Does this work in other browsers? No
 Safari hangs, other browsers do not have native shadow dom

Chrome version: 65.0.3325.181  Channel: stable
OS Version: 10.0
Flash Version:
 

Deleted: contenteditable.html 926 bytes

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