Use Ctrl-U for the "Mark message as unread" action.

My build doesn't compile currently though,
so this is untested - don't know if it overrides
the other "magic" (and non-working) Ctrl-U action.

svn path=/trunk/KDE/kdepim/; revision=812877

messageactions.cpp

@@ -109,6 +109,7 @@ MessageActions::MessageActions( KActionCollection *ac, QWidget * parent ) :
 
   action = new KAction( KIcon("mail-mark-unread"), i18n("Mark Message as &Unread"), this );
   action->setToolTip( i18n("Mark selected messages as unread") );
+  action->setShortcut( Qt::CTRL+Qt::Key_U );
   connect( action, SIGNAL(activated()),
            this, SLOT(slotSetMsgStatusUnread()) );
   mActionCollection->addAction( "status_unread", action );