Always set visual-line-mode to the intended state

Since the article buffer is re-used, visual-line-mode will keep its
previous state if not explicitly set.  So before the patch

1. I display article 1, which should be wrapped: the hook sets
visual-line-mode to t,

2. I display article 2, which should not be wrapped: truncate-lines is
set to t, but visual-line-mode remains t (not a biggie, truncate-lines
"wins"),

3. I decide I want to wrap article 2, so I call the visual-line-mode
toggling command: visual-line-mode is set to nil; seemingly nothing
happens.

This patch dispels the confusion.

1 files changed, 2 insertions, 2 deletions

diff --git a/.gnus b/.gnus
index 37a17af..056a1c6 100644
--- a/.gnus
+++ b/.gnus
@@ -189,8 +189,8 @@
   (setq fill-column 80
         my/centered-set-right-margin t)
   (my/centered-mode)
-  (when (my/gnus-article-should-wrap)
-    (visual-line-mode)))
+  (visual-line-mode
+   (unless (my/gnus-article-should-wrap) -1)))
 
 (add-hook 'gnus-article-prepare-hook 'my/gnus-article-setup)