Preview .patch file links in markdown comment

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If someone attaches a patch file to a comment, it'd be handy to be able to preview it inline. If I am reading comments (example) and want to quickly see what's in the patch, currently I have to download it and open in text editor, and later delete the file.

Proposal

Add a Preview button next to links to .patch files. On click, download file contents and display in a code block with diff syntax highlighting