Bug#827634: [patch] Detect window width every time :Man is called

[James McCoy]

Currently, man.vim lets $MANWIDTH, if it is empty, to the width of
the window at that time.  If :Man is later called in a different sized
window, the results will look wrong.

The attached patch lets $MANWIDTH to an empty value after running man,
if it was empty to start with.  This restores the state of $MANWIDTH, so
the width will be updated the next time :Man is used.

Cheers,
-- 
James
GPG Key: 4096R/91BF BF4D 6956 BD5D F7B7  2D23 DFE6 91AE 331B A3DB
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