makemessages ignores implicitly concatenated string literals

[Chris Bailey]

In our company we use python's implicit joining of string literals to break long lines in our codebase.
We just realised these are being ignored by makemessages.
Don't think this is a bug so much as a comment worth mentioning - maybe the docs could be updated?

So for example, on an initial site with the following in mysite/mysite/__init__.py:

from django.utils.translation import pgettext

var_1 = pgettext(
   'context1',
   'a singleline string',
)

var_2 = pgettext(
    'context2',
    (
         'A '
        'multiline '
        'string'
    )
)

django-admin makemessages -l es_ES produces:

# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
# This file is distributed under the same license as the PACKAGE package.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2018-04-25 17:05+0100\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
"Language-Team: LANGUAGE <LL@li.org>\n"
"Language: \n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"

#: mysite/mysite/__init__.py:5
msgctxt "context1"
msgid "a singleline string"
msgstr ""

[Claude Paroz]

It will work if you simply remove the parentheses around the second parameter. Anyway, this is gettext behavior, Django cannot do anything about it.