Slick Slider加载了display：none会导致错误的启动

I've got a gallery of thumbs and a Slick slider in a layer on top (z-index), hidden through css with display:none. When clicking on of the thumbs the display setting changes to block and the slider shows, But: The width/height/left/right etc of the slides are never calculated, check out this fiddle:I've got a gallery of thumbs and a Slick slider