Jonas Jenwald 0ba242ea4a Support FileAttachments with hash-signs in the filename (issue 15729)
The reason for the issue is that we use the generic `getFilenameFromUrl` helper function, which was originally intended for regular URLs.
For the filenames we're dealing with in FileAttachments, we really only want to strip the path when one exists[1].

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[1] See [bug 1230933](https://bugzilla.mozilla.org/show_bug.cgi?id=1230933) for an example of such a case.
2022-11-23 10:47:33 +01:00
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