src/vs/workbench/services/dialogs/electron-sandbox/fileDialogService.ts/FileDialogService/showSaveDialog
class FileDialogService:	async showSaveDialog(options: ISaveDialogOptions): Promise<URI | undefined> {
		const schema = this.getFileSystemSchema(options);
		if (this.shouldUseSimplified(schema).useSimplified) {
			return this.showSaveDialogSimplified(schema, options);
		}

		const result = await this.nativeHostService.showSaveDialog(this.toNativeSaveDialogOptions(options));
		if (result && !result.canceled && result.filePath) {
			return URI.file(result.filePath);
		}

		return;
	}