Invisible characters in email related souce files.

[zvyn]

BPO	21426
Nosy	@warsaw, @benjaminp, @bitdancer, @zvyn
Files	linebreak.patch: Reviewed and deleted or replaced unprintable '^L' in the source files.

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2014-05-04.13:39:00.415>
created_at = <Date 2014-05-04.13:34:10.827>
labels = ['expert-email']
title = 'Invisible characters in email related souce files.'
updated_at = <Date 2014-05-04.13:39:00.379>
user = 'https://github.com/zvyn'

bugs.python.org fields:

activity = <Date 2014-05-04.13:39:00.379>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2014-05-04.13:39:00.415>
closer = 'benjamin.peterson'
components = ['email']
creation = <Date 2014-05-04.13:34:10.827>
creator = 'zvyn'
dependencies = []
files = ['35149']
hgrepos = []
issue_num = 21426
keywords = ['patch']
message_count = 2.0
messages = ['217874', '217875']
nosy_count = 4.0
nosy_names = ['barry', 'benjamin.peterson', 'r.david.murray', 'zvyn']
pr_nums = []
priority = 'normal'
resolution = 'wont fix'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue21426'
versions = ['Python 3.5']

[zvyn]

I found non-printable characters in the source files of the email package. Vim rendered it as '^L', pasting it on the linux console has the same effect as CTRL+L. In most places it was combined with regular newlines, sometimes as a replacement, sometimes additionally to them.
My guess is that these files were saved with an editor replacing '\n' with '\r' and additional '\n' were inserted afterwards since the linebreaks seemed to be gone.

I replaced these chars by '\n' or '' in the attached patch.

[benjaminp]

They are page markers to assist in file nagivation. https://www.gnu.org/software/emacs/manual/html_node/emacs/Pages.html