Unlimited scrollback

[cowens]

Is your feature request related to a problem? Please describe.

Sometimes I need to scroll back more than my current scrollback_lines config allows, but I don't want to waste RAM.

Describe the solution you'd like

Switch the scrollback buffer from a VeqDeque to something like Yaque and allow scrollback_lines to be set to -1 for unlimited.

Describe alternatives you've considered

Buying more RAM

Additional context

iTerm2 has a similar feature.

[wez]

Essentially a duplicate of #1342

However, there is more to this than simply storing on disk; microsoft/terminal#1410 (comment) has some information on this topic, and subsequent discussion.

[wez]

Closing in favor of #1342 which has more discussion

[github-actions]

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