Backlog compression

[Atemu]

I often have an insane amounts of compiler output that I might need to be able to scroll back to, so I need to set a large backlog size.

This eats up a lot of memory of course and since it's mostly very repetitive text, I was wondering whether it could be compressed to massively cut down on memory usage. LZ4 would probably be more than fast enough for a good experience (it can do GiB/s on a single core).

This is more of a curiosity than a true feature request, feel free to close this as WONTFIX.