Copilot Summary

This pull request includes several changes to the src/diff.rs and src/widget_diff_tree.rs files, focusing on renaming the stage parameter to reverse and updating related logic accordingly.

Changes in src/diff.rs:

• Renamed the stage parameter to reverse in the get_line_chunk method and updated the method logic to reflect this change.
• Updated the conditional checks within the get_line_chunk method to use reverse instead of stage.
• Modified the logic to determine the starting line number based on the reverse parameter.

Changes in src/widget_diff_tree.rs:

• Renamed the stage parameter to reverse in the get_diff method and updated the method logic accordingly. [1] [2]
• Updated the stage and unstage methods to pass the correct boolean value to the get_diff method based on the new reverse parameter. [1] [2]