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Problem: `FileType directory` fires *before* the `BufEnter` path where `dir.lua` populates the buffer, in order to allow a 3P dir-browser plugin to handle the event and (optionally) rename the buffer to e.g. `example:///tmp/foo/`. But currently, `open_buffer()` continues after `filetypedetect BufRead` as if the original directory buffer is *still* current and valid, which may fall through to the built-in `nvim.dir` path after a 3P plugin ALREADY handled the directory. Solution: Keep a buf ref around the early `filetypedetect BufRead` call for directory buffers. If the `FileType directory` handler switches away from/deletes the original directory buffer, stop the open path instead of continuing into the built-in `nvim.dir` flow.