Comment 4 for bug 1891347

Gmail has a feature where if you select all when there are multiple pages, it shows some text and a link to ask if you want to select all on this page or all of the results that match your search. If you click the link, the text of the link is on the all of the results matching your search part, then it selects all results, otherwise it just applies to the current page. I think that could be a useful way to implement it.