It's not an issue of git.It's an issue of the plugin system built into Calibre. If you have the same plugin but one runs on PY3 and the other on PY2, there is no way to give the user the correct version based on which version of Calibre is being used. You would have to setup two different threads with the same named plugins. I don't know if Calibre's plugin system can even handle multiple plugins with the same name.
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