[Bug 849416]

[Stephane-gourichon-mozbugz]

Same as Daniel here. I experienced this bug on Linux. 
Can reproduce it now by displaying sample e-mail from comment 4 ( https://bugzilla.mozilla.org/show_bug.cgi?id=505024#c4 ) on 68.10.0 (64 bits).

In my case I received automatic invitation e-mails which did not have
any text, just the calendar entry. They appeared as totally blank
e-mail, only showing the e-mail source code allowed me to realize there
was a calendar entry.

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https://bugs.launchpad.net/bugs/849416

Title:
  text/calendar attachments are not shown at all

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