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[Sergei Ivanov <svivanov@xxxxxxxxxxx>]

I observed this bug in the previous LTS release (12.04?) and I confirm
it is still here in Ubuntu 14.04.1 (Thunderbird 31.2.0).

System details:
x86_64
nvidia graphics, nouveau driver
KDE enviroment
Happened in both Thunderbird and Firefox in Ubuntu 12.04. Under 14.04.1, I observed this bug in Thunderbird but not (yet?) in Firefox. 

Don't know how to reproduce it reliably, but it happens sufficiently often to be annoying.
When it happens, I usually force a window refresh by switching to another (fullscreen) window and back.

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https://bugs.launchpad.net/bugs/1301225

Title:
  Parts of Text disappear in Firefox and Thunderbird Editors /Text Areas

Status in firefox package in Ubuntu:
  Confirmed
Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  System info:
  Firefox 28
  Thunderbird 24.4.0
  Ubuntu 13.10 64 bit

  When I edit text in Firefox or Thunderbird,  parts of this text
  (usually entire rows above the cursor) seem to disappear while I type.

  This happens e.g. when I edit an email message inThunderbird, or edit
  a Jira comment or a Wikipedia page in Firefox.

  Sometimes the 'opposite' happens, i.e. a row is copied, so it is shown
  twice.

  The text is not really gone; I can restore it by selecting it (e.g.
  with Ctrl-a). I.e. only the text display is affected.

  The behavior is not quite reproducible. It does happen frequently, but
  I can't reproduce it exactly by typing the same text again.

  I had never observed this behavior before the latest Firefox upgrade.

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