No, it is not a misconception. How do I apply a patch from gmail to a specific git repo on my computer? (I would genuinely like to know the answer, but it must not involve mutt, gnus, or dovecot!)
Copy-paste may not work depending on how the email client renders the email. For example, if the email client doesn't preserve prefixed whitespace, then the resulting patch may be corrupted or not apply. Saving the actual email to a file on disk would avoid that issue.
OK thanks, that sounds fairly convenient for small patches. And I expect you'd say download the email for larger patches (as a sibling commenter suggests).
In the worst case you can copy paste a patch into a new local file in the repo and then apply it with git from there. I’ve had somebody slack me patches before and it is not a big lift.
Most people are using gmail, but when it comes to local clients, Outlook, Apple Mail and Thunderbird are by far the most common and as far as I know none of them support this without extra steps.