[Bug 1960614] [NEW] Add mid: scheme handler to thunderbird.desktop

[Max]

Public bug reported:

Since thunderbird-91 version (actually even earlier, but only ESR
releases are packaged in Ubuntu) it is possible to open particular
messages from command line using Message-ID:

    thunderbird mid:asdf at example.com

See e.g. https://bugzilla.mozilla.org/264270

However to open links from other application "mid:" scheme should be
advertised in the thunderbird.desktop file:

    MimeType=x-scheme-handler/mailto;application/x-xpinstall;x-scheme-
handler/mid;

Please, adjust this field in the desktop file. To check that the change
has effect the following command may be used:

    xdg-open mid:asdf at example.com

Notice that it is not upstream issue. Thunderbird developers left
desktop integration up to maintainers of Linux distributions.

Long time ago it was possible to create such links to particular
messages using thunderlink extension but migration from XUL to
WebExtension add-ons broke it. Support of mid: scheme restores linking
of mail messages from other applications.

There is a related issue: request to add message/rfc822 MIME type in
lp:1861262

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1960614

Title:
  Add mid: scheme handler to thunderbird.desktop

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