This bug has been plaguing me for 6 months at least but I was unable to
track it down - until today.

The preview pane hangs (won't refresh on scrolling, doesn't change emails and 
is generally unusable) as described.
This happens regularly to me and is always triggered by certain emails in my 
Inbox.

Usually the emails triggering this bug are plain-text (server/system-
generated) multipart emails with, for example, long CSV attachments - or
copy log files emailed to me from appliances. I have many emails that I
cannot view. Evolution's preview window hangs 90% of the time on these
emails. "Formatting Message" takes a long time on these messages too.

Force shutdown or restart of evolution is required to view any other
email.

running with LIBOVERLAY_SCROLLBAR=0 makes the problem go away, albeit with a 
workaround.
Eureka!

As an Eclipse user too this LIBOVERLAY_SCROLLBAR has been a nuisance
from day one of its inception. It bugs out all the main apps I use.

I suspect from visual observations that this issue is due to a rapid
stream of continuous widget scroll area size change events that causes
overlay scrollbar to break the widget. Some apps used to disappear;
evolution has a widget hang.

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https://bugs.launchpad.net/bugs/959276

Title:
  Scrolling message in preview breaks rendering

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