The melee pairing fix is now fully tested and available as a pull request:
Your pull request has now been merged and I have assembled and put a beta version here: https://robocode.sourceforge.io/files/robocode-22.214.171.124-Beta-setup.jar
If you are satisfied with this version, I will make the release. :-)
It seems that the codesize part is not working completely. Both in roborumble and in the builtin editor. info: I'm using Oracle JDK 1.8.0_181 on mac.