Preserve explicit line breaks

[malte-v]

Could you add a way to stop the formatter from turning this..

  grid-template: "header"      40px \
                 "main-router" 1fr  \
                 "footer"      30px \
                / 1fr               \

...into this:

  grid-template: "header" 40px "main-router" 1fr "footer" 30px / 1fr

Thanks!

[cyberbiont]

In my case it just deletes everything if I dont' write it in one line with property name

grid-template-areas: 
                "header header"\ 
        "sidebar breadcrumbs"\
        "sidebar content"\
        "footer footer"