formatting of gpg blocks

[0]

When including one gpg block inside another, as in public key inside a
signed message, there is a space created after the first dash.
Like here:
- -----BEGIN PGP PUBLIC KEY BLOCK-----
Why is this needed? This complicates working with the message (I have to
manually remove the space if I want to import the public key) and I
haven't found any info about it.

Another question is, when I'm sending a message with my public key, if
I'm going to sign the message, should I also sign the public key? That
amounts to two signatures.