Bug 1574222 Comment 12 Edit History

Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.

And based on comment 10, the expected result of the attachments is:
```
auto: [text-decoration: 'rgb(0, 0, 0)', text-decoration-thickness: 'auto']
fromFont: [text-decoration: 'rgb(0, 0, 0) from-font', text-decoration-thickness: 'from-font']
tenPx: [text-decoration: 'rgb(0, 0, 0) 10px', text-decoration-thickness: '10px']
```
And based on comment 10, the expected result of the attachment is:
```
auto: [text-decoration: 'rgb(0, 0, 0)', text-decoration-thickness: 'auto']
fromFont: [text-decoration: 'rgb(0, 0, 0) from-font', text-decoration-thickness: 'from-font']
tenPx: [text-decoration: 'rgb(0, 0, 0) 10px', text-decoration-thickness: '10px']
```

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