Remove "email" context menu entry in certain conditions.

Nathan Teodosiorequested to merge
nteodosio/nautilus:nautilus-sendto into ubuntu/latest

LP: 2072569.

As a folder cannot be an attachment, Nautilus first compresses it to a zip file, which it creates in /tmp, to which a snap doesn't have access.

So if {nautilus_sendto && mailer is a snap && folder is in selection}, do not present emailing as an option in the context menu.

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