src/vs/workbench/services/mode/common/workbenchModeService.ts/WorkbenchModeServiceImpl/_onReady
class WorkbenchModeServiceImpl:	protected override _onReady(): Promise<boolean> {
		if (!this._onReadyPromise) {
			this._onReadyPromise = Promise.resolve(
				this._extensionService.whenInstalledExtensionsRegistered().then(() => true)
			);
		}

		return this._onReadyPromise;
	}