Fix leaf-node coloring in multi-argument mode; add regression test#345

Copilot wants to merge 4 commits intocopilot/add-color-flag-and-mappingKSXGitHub/parallel-disk-usage:copilot/add-color-flag-and-mappingfrom

copilot/add-test-for-leaf-node-coloringKSXGitHub/parallel-disk-usage:copilot/add-test-for-leaf-node-coloringCopy head branch name to clipboard