Launcher `--workDir` option and launcher profile's game directory setting are both ignored

[HalfOfAKebab]

I run the launcher with --workDir "D:\Users\Lewis\AppData\Roaming\.minecraft". I also set the game directory (in the launcher's profile) to D:\Users\Lewis\AppData\Roaming\.minecraft\directories\ThroughTime. Despite this, the game still uses the directory in %APPDATA%\.minecraft.

This has been observed in inf-20100415; I'm not sure if this affects any more versions.