[Evolution] Hang while formatting message

["Patrick O'Callaghan" <poc usb ve>]

This is in 2.3.7 and 2.3.8 at least, maybe other versions as well.

Often, when some HTML-formatted message is in the preview pane, I see
the message text and graphic placeholders, the status message at the
bottom says "Formatting message (...)" and never terminates, i.e. the
preview pane is now stuck on the message that provoked the problem. Note
that Evo itself doesn't hang: I can double-click on other messages and
see them, change folders, set preferences, send and receive mail, etc.
etc., but I cannot change the contents of the preview pane again without
forceably killing Evo and restarting.

"Cancel" does nothing.

"Quit" causes the Evo window to grey out and sit there forever. (<rant>
A Quit button should quit the application *always* -- IMHO an end user
shouldn't have to know about "evolution --force-shutdown"; I actually
have a special "KillEvo" button on my desktop since I need it so often,
even with supposedly stable versions of Evo </rant>).

In Preferences I have "Show animated images" OFF, and "Load images in
mail from contacts" ON. I've played with various combinations of these
without affecting the frequency of this bug.

poc