Rendering test using virtual screen #656
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This pull request is a PoC of rendering test with virtual screen.
Since we introduced differential rendering in #614, LineEditor now have a cache of what LineEditor rendered to the screen. In other words, LineEditor now have a virtual screen internally. We can use it for testing.
We still need yamatanooroti, but we can reduce using it to make CI faster.
Key actor test: use this virtual screen test
Test of render_differential correctly rendered to terminal: use yamatanooroti
Test some edge cases, Test rendering through multiple readmultiline: use yamatanooroti
TODO: specify terminal window size