[Bug]: RollingLogger move_back method ignoring amount parameter

[caocao-sys]

Is there an existing issue for the same bug? (If one exists, thumbs up or comment on the issue instead).

• I have checked the existing issues.

Describe the bug and reproduction steps

Bug Description:

There is a bug in the [move_back] method of the [RollingLogger] class in /openhands/core/logger.py. The method accepts an [amount] parameter to specify how many lines to move the cursor back, but it incorrectly uses self.max_lines instead of the calculated [amount] value in the actual cursor movement operation.

Code Location:

File: openhands/core/logger.py
Method: RollingLogger.move_back()

Expected Behavior:

When calling [move_back(5)], the cursor should move back exactly 5 lines.

Actual Behavior:

When calling [move_back(5)], the cursor moves back self.max_lines lines instead of 5 lines, because the method ignores the [amount] parameter in the actual implementation.

Reproduction Steps:

1. Create a [RollingLogger] instance with max_lines=10
2. Call [move_back(3)]
3. Observe that the cursor moves back 10 lines instead of 3 lines

Impact:

This bug affects the debugging experience when using the rolling logger, as the cursor positioning becomes incorrect when custom amounts are specified.

OpenHands Installation

Docker command in README

OpenHands Version

main

Model Name

claude-3-7-sonnet-20250219

Operating System

MacOS

Logs, Errors, Screenshots, and Additional Context

No response