I have a GPG key block copied from the browser that can be pasted into "cat
>/dev/null" without problem. However when I try to paste it into "gpg", the
block looks strange, and gpg refuses to accept it.
The key block in question is that from https://handbrake.fr/openpgp.php.

When pasting into cat, the block ends like this:
> cat >/dev/null
-----BEGIN PGP PUBLIC KEY BLOCK-----
mQINBFkQpw8BEADpPeQ2xW4rVObYATTXCWGA4nHmaHkDzWMqrHRXspx80KL2Lv/8
...
TalAuh1G9VxHGQR88NntjQOK
=2vLY
-----END PGP PUBLIC KEY BLOCK-----^C

When pasting into gpg, the block ends like this:
> gpg
gpg: Go ahead and type your message ...
-----BEGIN PGP PUBLIC KEY BLOCK-----
mQINBFkQpw8BEADpPeQ2xW4rVObYATTXCWGA4nHmaHkDzWMqrHRXspx80KL2Lv/8
...
N9R0KA2Tau8RgIr14e9ws1i/NylW7z/CXMtxGiWwegWJxl5ZcVKmG/3e/Nh4Am0PJ
TalAuh1G9VxHGQAR88NntjQOK
=2vLY
-----END PGP PUBLIC KEY BLOCK-----4nHmaHkDzWMqrHRXspx80KL2Lv/8\n

And gpg outputs "gpg: invalid armor header: "