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by rossy 1707 days ago
Things weren't so nice in Windows before Microsoft added VT control sequences to Windows 10. Before then, if you wanted to draw fancy stuff in a console window, you had to call a synchronous out-of-band IPC API to conhost.exe. I don't know how PowerShell did it specifically, but you'd need to make the same sequence of slow IPC calls to draw the progress bar even if you did buffer them.