Wanderlust uses "mime-view" internally for displaying mail messages. Sometimes "text/plain" messages actually have very long lines (like "text/flowed".
If in mime-view I toggle
visual-line-mode message is displayed correctly. I've tried to add the following hook:
(add-hook 'mime-display-text/plain-hook (lambda () (visual-line-mode t)))
Unfortunately it doesn't work -
visual-line-mode is set, but message is still displayed unwrapped. Any ideas how that could be solved?