[Bug 1525954] [NEW] mailman-2.1.20: option "subject_prefix": prefix trailing blanks are removed when subject lines have non-ASCII characters

[sphakka]

Public bug reported:

Trailing blanks on option "subject_prefix" are removed on subject lines
with non-ASCII characters. F.i., with options

  preferred_language = "Français"
  subject_prefix = "[prefix] "

(irrespective of encode_ascii_prefixes)

sending this (via Seamonkey Mail, LANG=en_US.UTF-8):

  Subject: "[prefix] c'est du français"

results in reception of:

  Subject: "[prefix]c'est du français"

** Affects: mailman
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1525954

Title:
  mailman-2.1.20: option "subject_prefix": prefix trailing blanks are
  removed when subject lines have non-ASCII characters

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