R1:0a51bc4f05bf

Add a space after "View Inline" in mail to prevent double-click on the filename from selecting "Inline"

Summary:
See PHI920. Ref T13210. Since the HTML is just:

```
<a>View Inline</a><span>filename.txt</span>
```

..double-clicking "filename.txt" in email selects "Inlinefilename.txt".

Add a space to stop this. At least in Safari, a space between the tags is not sufficient (perhaps because the parent is a `<div>`?). I couldn't find an authoritative-seeming source on what the rules for this actually are…