src/vs/workbench/api/common/extHostSCM.ts/ExtHostSourceControl/constructor
class ExtHostSourceControl:	constructor(
		private readonly _extension: IExtensionDescription,
		proxy: MainThreadSCMShape,
		private _commands: ExtHostCommands,
		private _id: string,
		private _label: string,
		private _rootUri?: vscode.Uri
	) {
		this.#proxy = proxy;

		this._inputBox = new ExtHostSCMInputBox(_extension, this.#proxy, this.handle);
		this.#proxy.$registerSourceControl(this.handle, _id, _label, _rootUri);
	}