VScode
Where does VSCode/VSCodium store info ?
Two places
- ~/.vscode(or- ~/.vscode-ossfor VSCodium)
- Depending on your platform, the user settings file is located here: - Windows %APPDATA%\Code\ or %APPDATA%\VSCodium
- macOS $HOME/Library/Application Support/Code/ or $HOME/Library/Application Support/VSCodium/
- Linux $HOME/.config/Code/ or $HOME/.config/VSCodium/
 
I needed to cleanup both the locations to wipe clean the traces of VSCode/VSCodium
Relative Line numbers
Use the editor.lineNumbers setting with the value of relative
Manually installing/updating extensions
Sometimes VSCodium can not connect to the OpenVSX registry (aka Extensions Marketplace)
Most of the time, this is temporary. But in case you can not wait to install new
 extension or upgrade existing one, you can download the extension from
 OpenVSX web site and then drag-and-drop the .vsx
 file in the Extensions list.
Auto format rust code on save
Add the following to settings.json
"[rust]": {
    "editor.defaultFormatter": "rust-lang.rust-analyzer",
    "editor.formatOnSave": true
}