Description of problem:
Image files for HTML email from a non-responding server lock up the preview pane.
Cancelling the image file download has no effect.  Even quitting Evolution is blocked until the maximum socket timeout is apparently reached (typically 5+ minutes).
It is possible to view other emails while the problem is in play, by double-clicking on another message and bringing up a new message window, but this forces the user into an abnormal message review situation.
I typically receive about 3 of these emails every day, causing a lot of frustration due to this bug.


Version-Release number of selected component (if applicable):
Evolution 3.2.3
Fedora is a fully up-to-date F16 workstation.

How reproducible:
Every time the web server cannot respond for various reasons.


Steps to Reproduce:
1. Start Evolution
2. Read an html email where the originating site will not respond with image data
3. Observe download hangs, blocking many parts of Evolution, including exit.
  
Actual results:
Evolution partially hung.

Expected results:
Evolution should not block on delayed image files, and should be able to successfully cancel these downloads.

Additional info: