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[Manuel Vazquez Acosta <1249940@xxxxxxxxxxxxxxxxxx>]

With Thunderbird 38.5.1 on Ubuntu 14.04 I see this issue as well.

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https://bugs.launchpad.net/bugs/1249940

Title:
  Thunderbird picks incorrect mime type for inline picture when drag-
  and-dropping

Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  When I attach png images by dragging from the file browser to the
  header region of the compose window, they are attached with correct
  mimetype.

      Content-Type: image/png;
      name="foo.png"
      Content-Transfer-Encoding: base64
      Content-Disposition: attachment;
      filename="foo.png"

  Similarly, *inline* png images attach fine when using Thunderbird's
  native file picker.

      Content-Type: image/png;
      name="foo.png"
      Content-Transfer-Encoding: base64
      Content-ID: <part1.random_numbers@xxxxxxxxxx>
      Content-Disposition: inline;
      filename="foo.png"

  However, when I attach them inline by *dragging* from the file browser
  into the body, they are attached with the incorrect mime type as

      Content-Type: text/plain; charset=ISO-8859-1
      Content-Transfer-Encoding: base64
      Content-ID: <part1.00030206.09040704@xxxxxxxxxx>

  The latter displays fine for the recipient if they are using
  Thunderbird, or via the gmail web interface. However, OSX Mail.app
  users only see a text file <Mail Attachment.txt> full of nonsense.
  Kmail also fails to display the image correctly.

  It seems that Thunderbird is using the wrong mime type when png images
  are attached inline. (I also see a similar problem with .jpg files.)

  I see the same problem whether dragging from Dolphin file browser,
  Konqueror, Krusader, Firefox (via the browser window itself), and
  Kate's file picker. With Firefox, I entered the file path into the url
  bar, and dragged from the main browser window. I also attempted to
  install Nautilus, but I can't even drag from it (with KDE). I've also
  tried dragging from Firefox's browser window in Xubuntu, which had the
  same problem.

  I tried safe mode, and this didn't fix it. Finally, installing
  Thunderbird directly from the website *does* fix the problem so it's a
  problem introduced in the Ubuntu package.

  TB 24.1.0
  Kubuntu 13.10
  KDE 4.11.2

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: thunderbird 1:24.1.0+build1-0ubuntu0.13.10.1
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  lee        2253 F.... pulseaudio
  BuildID: 20131028125905
  CRDA:
   country AU:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (3, 23)
   	(5250 - 5330 @ 40), (3, 23), DFS
   	(5735 - 5835 @ 40), (3, 30)
  Channel: Unavailable
  Date: Mon Nov 11 15:18:44 2013
  DefaultProfilePrefSources:
   prefs.js
   /usr/lib/mozilla/extensions/{3550f703-e582-4d05-9a08-453d09bdfdc6}/{847b3a00-7ab1-11d4-8f02-006008948af5}/defaults/preferences/enigmail.js
   /usr/lib/mozilla/extensions/{3550f703-e582-4d05-9a08-453d09bdfdc6}/{847b3a00-7ab1-11d4-8f02-006008948af5}/defaults/preferences/000system.js
   [Profile]/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/defaults/preferences/lightning.js
   [Profile]/extensions/{9533f794-00b4-4354-aa15-c2bbda6989f8}/defaults/preferences/prefs.js
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2012-12-16 (329 days ago)
  InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
  IpRoute:
   default via 192.168.1.254 dev wlan0  proto static 
   192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.4  metric 9
  MarkForUpload: True
  MostRecentCrashID: bp-8716a067-8317-4ad0-808a-2254e2120524
  Profile1PrefSources:
   prefs.js
   /usr/lib/mozilla/extensions/{3550f703-e582-4d05-9a08-453d09bdfdc6}/{847b3a00-7ab1-11d4-8f02-006008948af5}/defaults/preferences/enigmail.js
   /usr/lib/mozilla/extensions/{3550f703-e582-4d05-9a08-453d09bdfdc6}/{847b3a00-7ab1-11d4-8f02-006008948af5}/defaults/preferences/000system.js
  Profile1Prefs:
   extensions.lastAppVersion: "24.0" (prefs.js)
   network.cookie.prefsMigrated: true (prefs.js)
  Profiles:
   Profile0 (Default) - LastVersion=24.1.0/20131028125905 (In use)
   Profile1 - LastVersion=24.0/20130917155107 (Out of date)
  RelatedPackageVersions:
   kopete            4:4.11.2-0ubuntu1
   google-talkplugin 4.7.0.0-1
   rhythmbox-mozilla 2.99.1-0ubuntu1
  RunningIncompatibleAddons: False
  SourcePackage: thunderbird
  SubmittedCrashIDs:
   bp-8716a067-8317-4ad0-808a-2254e2120524
   bp-8c247ae3-5982-4262-b65d-57a252120307
   bp-1ab81b2c-1607-4919-868d-380852120205
  UpgradeStatus: Upgraded to saucy on 2013-10-18 (24 days ago)
  dmi.bios.date: 09/07/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A19
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 0XN71K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: FAB1
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA19:bd09/07/2012:svnDellInc.:pnDellSystemXPSL702X:pvr:rvnDellInc.:rn0XN71K:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L702X
  dmi.sys.vendor: Dell Inc.

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