NeatGuyCoding opened a new pull request, #4008:
URL: https://github.com/apache/logging-log4j2/pull/4008

   Fix writeHeader computation in RollingRandomAccessFileManager
   
   The writeHeader boolean was computed after creating the RandomAccessFile, 
which creates the file if it doesn't exist. This made file.exists() always 
return true, causing incorrect header write decisions.
   
   This change captures the file's pre-existing state before opening the 
RandomAccessFile by:
   - Declaring a fileExistedBefore boolean initialized to false
   - Setting it by checking fileName != null && new File(fileName).exists() 
before calling new RandomAccessFile(...)
   - Using !fileExistedBefore instead of !file.exists() in the writeHeader 
calculation
   
   When fileName is null, fileExistedBefore remains false as expected.


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