Improve function hot fix for app benchmark

[similato87]

Summary

This PR addresses an uncommon issue where the validation process enters an infinite recursion during the identification of the start line in diffs, particularly when dealing with sequential diffs provided by LLMs on certain files. The core problem arises from the validation mechanism relying on the original file state, which doesn't account for changes introduced in sequential diffs. This issue is exacerbated when the original file is empty, leading to infinite recursive calls.

Key Changes

• Infinite Recursion Fix: Implemented a robust mechanism to prevent infinite recursion when validating diffs, especially in cases where the original file is empty.
• Sequential Diffs Restriction: Introduced restrictions on LLMs to limit the provision of sequential diffs, ensuring that the validation process is aligned with the current state of the file after each individual diff.
• Test Enhancements: Conducted comprehensive updates and enhancements to the test cases within test_chat_to_file, improving the reliability and coverage of our testing suite.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.02%. Comparing base (df593e1) to head (605e499).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1095      +/-   ##
==========================================
+ Coverage   75.67%   76.02%   +0.34%     
==========================================
  Files          27       27              
  Lines        1566     1568       +2     
==========================================
+ Hits         1185     1192       +7     
+ Misses        381      376       -5     

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