[Bug 1048618]

[Ludovic-mozilla]

(In reply to :aceman from comment #56)
> Are they informed about that? Does the preview pane contain some "further
> messages were hidden" footnote?

yes at the bottom of the summary view

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https://bugs.launchpad.net/bugs/1048618

Title:
  Selecting multiple messages in a folder with a lot of messages causes
  CPU to spike, application to become unresponsive

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