[Webkit-unassigned] [Bug 184217] New: line breaking should be possible between alphanumeric and fullwidth opening punctuation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=184217

            Bug ID: 184217
           Summary: line breaking should be possible between alphanumeric
                    and fullwidth opening punctuation
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: murakami at vivliostyle.org
                CC: mmaxfield at apple.com

Test HTML+CSS at: http://jsbin.com/hobiko/edit?html,css,output
or:
```
<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 "「".

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