virtual-scroll: design interaction with print page

How will virtual scrolling work when the user prints the page?

We probably want to render more elements than what the user sees on screen when they go to print the page. If its a reasonable size list (e.g. 100 items) we could just render the whole list in print mode. But what about larger lists (e.g. 1000000 items)? what about async data that needs to be fetched from the server?

The issue names no files or tests. Start by reviewing the virtual-scroll component and its print behavior, then investigate how large and asynchronous lists could be rendered for printing. Done would require an agreed design covering ordinary lists, very large lists, and data fetched from the server.

Written by the indexing model from the issue text.