REPL cursor in big input 'stops' at top visible line

### Version v25.0.0-pre ### Subsystem repl ### What steps will reproduce the bug? When working with multiline inputs that have more lines than the terminal heights (in lines), moving all to the top of the big input causes the current lower part of the input to be rendered at all times. The cursor effectively moves up, the lower lines just stay the same instead of changing. This happens when pressing up at the top visible line. ### How often does it reproduce? Is there a required condition? Always ### What is the expected behavior? Why is that the expected behavior? The lines are changed. ### What do you see instead? Wrong cursor movement.