How to indicate multiple window lines that belong to a long line in a file

Currently I use "set number" for this purpose. But it takes a lot of
window space. So I wonder whether there is a better way to do it, such
as the way used in Emacs window (showing a little line wrap symbol at
the end of a window line if it continues to the next window line), or
maybe show alternative background colors for different long lines? Any
ideas?

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