Fix for XMonad with XMobar

When I updated XMonad late last year (2015), I noticed a bug where any application that I opened on my first workspace would cover XMobar.

E.g. Opening a terminal or Vivaldi took up the entire screen.

The solution I found was, conveniently, located in a post on the ArchLinux forum.

Essentially, you just need to add a handleEventHook with docksEventHook and handleEventHook defaultConfig.

-- My overall config that is used elsewhere
myConfig = defaultConfig
    { manageHook = manageDocks <+> manageHook defaultConfig
    , layoutHook = avoidStruts $ layoutHook defaultConfig
    , handleEventHook = mconcat
                        [ docksEventHook
                        , handleEventHook defaultConfig ]
    , startupHook = setWMName "LG3D"
    , terminal = "urxvtcd"
    , modMask = mod1Mask
    , borderWidth = 1
    , focusedBorderColor = "blue"
    }