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When expanded=1&filter_truncate=3, row truncation (and grouping under "Others") should be applied to the datatable and all children tables.
Typically, we would call Actions.getPageUrls and truncate at 3, to get a full tree view of the pages url structures, while keeping number of rows limited.
This is especially useful for #2137 for Scheduled reports to include recursive views for page urls.
(In ) Fixes #2816