[kmail2] [Bug 362650] an extra space character in attached file names the UTF-8 encoded

[Alexander Yavorsky via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=362650

--- Comment #4 from Alexander Yavorsky <walker at mail.ru> ---
Created attachment 101123
  --> https://bugs.kde.org/attachment.cgi?id=101123&action=edit
Source screenshot

In source i see encoded filename spited into three rows and exactly at breaks
occurs additional  spaces:

-----source----
------sOA2imNDPik6TVvdYIdSdZP56q77z6Ia-zEBUqmjdMGgRKwkE-1461416403
Content-Type:
application/vnd.openxmlformats-officedocument.wordprocessingml.document;
name="=?UTF-8?B?0JTQvtCz0L7QstC+0YAgMSDQvdCwINC+0LrQsNC30LDQvdC40LUg0YPRgdC7?=
 =?UTF-8?B?0YPQsyDQv9C+INC+0LHRgNCw0LHQvtGC0LrQtSDQv9C+0YfQstGLLiDQotC1?=
 =?UTF-8?B?0YXQvdC+0LvQvtCz0LjRjy4g0KLQsNC70LTQvtC8LmRvY3g=?="
Content-Disposition: attachment
Content-Transfer-Encoding: base64

UEsDBBQABgAIAAAAIQDYiDys8gEAANUJAAATAAgCW0NvbnRlbnRfVHlwZXNdLnhtbCCiBAIooAAC
...
-----source----

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