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[Colin Law <890177@xxxxxxxxxxxxxxxxxx>]

I wonder whether it is the scrolling that triggers the problem.  Are you able to type text *above* the message (top posting will be allowed for this test case).
Alternatively, in the original message the long line was itself top posted so the complete email filled the window, perhaps it is the scrolling in this case that caused the problem.
I will do some further tests myself.

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https://bugs.launchpad.net/bugs/890177

Title:
  Long line of kisses locks up processor in Thunderbird

Status in “thunderbird” package in Ubuntu:
  New

Bug description:
  To replicate, send an email to Thunderbird client containing a line of 40,000 'x' characters, from a client that does not split the lines.  In thunderbird attempt to reply to this email and it locks the processor at 100% for several minutes.  I may be necessary to start typing into the reply to trigger the effect.
  I have not tested to determine whether the fact that they are kisses embarrasses Thunderbird so that it gets all in a tizzy, or whether any long line would achieve the same effect.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: thunderbird 7.0.1+build1+nobinonly-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic i686
  NonfreeKernelModules: nvidia
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  colinl     1359 F.... pulseaudio
  BuildID: 20110929181644
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'NVidia'/'HDA NVidia at 0xf9ef8000 irq 20'
     Mixer name	: 'Realtek ALC888'
     Components	: 'HDA:10ec0888,14627369,00100001'
     Controls      : 37
     Simple ctrls  : 22
  Channel: release
  Date: Mon Nov 14 11:32:38 2011
  ForcedLayersAccel: False
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  IpRoute:
   default via 192.168.1.1 dev eth0  proto static 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.100  metric 1
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  Profiles: Profile0 (Default) - LastVersion=7.0.1/20110929181644
  RfKill:
   
  RunningIncompatibleAddons: False
  SourcePackage: thunderbird
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/20/2007
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V2.4
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: MS-7369
  dmi.board.vendor: MSI
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV2.4:bd11/20/2007:svnMSI:pnMS-7369:pvr1.0:rvnMSI:rnMS-7369:rvr1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: MS-7369
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI

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