Tails

This one is quite often making the test suite runs in Jenkins fail. Most of the time, it prints out the error:

[log] TYPE "asdf
"
[log] CLICK on (208,71)
[log] RIGHT CLICK on (568,376)
[log] RIGHT CLICK on (566,376)
[log] RIGHT CLICK on (566,376)
[log] RIGHT CLICK on (566,376)
[log] RIGHT CLICK on (566,376)
    And I symmetrically encrypt the message with password "asdf"      # features/step_definitions/encryption.rb:126
      try_for() timeout expired
      Last ignored exception was: FindFailed: can not find GeditPaste.png on the screen. (Timeout::Error)
      ./features/support/helpers/misc_helpers.rb:83:in `rescue in try_for'
      ./features/support/helpers/misc_helpers.rb:33:in `try_for'
      ./features/step_definitions/common_steps.rb:30:in `context_menu_helper'
      ./features/step_definitions/encryption.rb:65:in `paste_into_a_new_tab'
      ./features/step_definitions/encryption.rb:132:in `/^I symmetrically encrypt the message with password "([^"]+)"$/'
      features/encryption.feature:34:in `And I symmetrically encrypt the message with password "asdf"'

Attached is a screenshot that is looking like the ones that are taken when this issue arise.

More informations if needed can be found in run #287, and #291 to #293 of the test_Tails_ISO_devel job, as well as run #243, #245 and #257 of job test_Tails_ISO_stable.