code: func Decor(mh *Hints) bool {
  	if mh.Flags&HintDecorations > 0 {
  		noDecor := mh.Decoration == DecorationNone ||
  			(mh.Decoration&DecorationAll == 0 &&
  				mh.Decoration&DecorationTitle == 0 &&
  				mh.Decoration&DecorationResizeH == 0)
  		return !noDecor
  	}
  	return true
  }
docs: // Decor checks a Hints value for whether or not the client has requested
  // that the window manager paint decorations.
  // That is, Decor returns false when the hints provided indicate no
  // decorations and true otherwise.