src/vs/workbench/api/browser/mainThreadSCM.ts/MainThreadSCMProvider/$registerGroups
class MainThreadSCMProvider:	$registerGroups(_groups: [number /*handle*/, string /*id*/, string /*label*/, SCMGroupFeatures][]): void {
		const groups = _groups.map(([handle, id, label, features]) => {
			const group = new MainThreadSCMResourceGroup(
				this.handle,
				handle,
				this,
				features,
				label,
				id
			);

			this._groupsByHandle[handle] = group;
			return group;
		});

		this.groups.splice(this.groups.elements.length, 0, groups);
	}