backtrace does not use the pager

[justin808]

With rails stacks having about 120 frames, I'd like backtrace to be able to show the last 10 frames, etc.

Maybe a simpler solution is to just have backtrace use the pager?

Other commands like history --all use the pager.

[zenspider]

I wouldn't want the pager in this one case tbh... here is an alternative backtrace that is potentially much shorter than before:

https://gist.github.com/zenspider/8049ee1bc6b994e2098508d278183dbc