xmonad.hs:300:3: warning: [-Wtabs]
    Tab character found here, and in 12 further locations.
    Please use spaces instead.
    |
300 |          spawn "polybar-msg cmd toggle")
    |   ^^^^^^

xmonad.hs:412:43: warning: [-Wdeprecations]
    In the use of ‘spacing’ (imported from XMonad.Layout.Spacing):
    Deprecated: "Use spacingRaw instead."
    |
412 | addSpace     = renamed [CutWordsLeft 2] . spacing gap
    |                                           ^^^^^^^