Refactor `cursor_up` and `cursor_down` functions to support multi-lin… #255

Job	Run time
compiling-with-prod-on-windows	10m 15s
compiling-with-prod (macos-latest)	10m 25s
linting	3m 9s
compiling-with-prod (ubuntu-latest)	15m 32s
	39m 21s

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