Add warning for ignored data after quoted form parameter #7394
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I figured that printing the data can be a lot clearer than explaining the abstract rule, particularly if you have a longer command and you'd have to figure out which part it's coming from.
There is that. Operating on arbitrary user input which was never correct in the first place does carry a security risk though. That being said, I don't see an attack vector angle here but it's treading onto territory which can be minefields for future bugs.
In an argument like `-F 'x=@/etc/hostname;filename="foo"abc'` the `abc` is ignored. This adds a warning if the ignored data isn't all whitespace.
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