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

[BridgeAR]

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.

[ShivrajShelar99]

@BridgeAR Could you please review this PR? It fixes the REPL multi-line input and cursor navigation issue. Thanks!

[tarunbatra]

Hey @BridgeAR , I was going to take a stab at this one. However, I am not sure what the exact issue is. I wasn't able to replicate it locally with multi-line inputs. Can you elaborate on the difference between actual and expected behavior?

repl-repro.mov

[BridgeAR]

@tarunbatra I indeed did not describe the issue properly earlier. Thank you for pointing that out!

It must be an input that has more lines than the whole terminal is able to show at that time.

[Han5991]

@BridgeAR Does this screen recording show the bug correctly?

2025-10-09.9.13.24.mov

[tarunbatra]

I have added a PR as well on this. #60222 @BridgeAR

I am still working on coming up with a test for this case. Meanwhile I would appreciate any reviews I can get.