The doc for RegionFunction states:

However, RegionFunction is not mentioned in the doc for ListLinePlot.
Trying to use it:

So, it seems a doc issue. Any ideas?
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I think it’s a bug, in the documentation. Supporting
RegionFunctioninList(Line)Plotwould be a good feature addition, however. (Please email support@wolfram.com.)One workaround would be to replace points that are “out of bounds” with
None: