[issue43554] email: encoded headers lose their quoting when refolded

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[issue43554] email: encoded headers lose their quoting when refolded

New submission from Emil Styrke : When a header with an encoded (QP or Base64) display_name is refolded, it may lose (some of) its encoding. If it then contains illegal "atext" tokens, an invalid header will result. For example, `From: =?utf-8?Q?a=2C=20123456789012345678901234567890123456?=