UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3384.0 Safari/537.36

Example URL:
http://jsbin.com/hobiko/edit?html,css,output

Steps to reproduce the problem:
1. open the test html+css

```
<style>
p {
  width: 10em;
  background: yellow;
}
</style>
<p>あいうえおかきくけa「さしすせそ」</p>
<p>あいうえおかきくけ1「さしすせそ」</p>
```

What is the expected behavior?
Line breaking should occur as follows:

```
あいうえおかきくけa
「さしすせそ」

あいうえおかきくけ1
「さしすせそ」
```

What went wrong?
Line breaking occurs as follows:
```
あいうえおかきくけ
a「さしすせそ」

あいうえおかきくけ
1「さしすせそ」
```

It seems that line breaking is mistakenly prohibited between non-cjk letter or number and fullwidth opening punctuation such as "「".

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 67.0.3384.0  Channel: canary
OS Version: 10.0
Flash Version: