src/vs/workbench/api/browser/mainThreadSCM.ts/MainThreadSCMResourceGroup/splice
class MainThreadSCMResourceGroup:	splice(start: number, deleteCount: number, toInsert: ISCMResource[]) {
		this.elements.splice(start, deleteCount, ...toInsert);
		this._onDidSplice.fire({ start, deleteCount, toInsert });
	}