extensions/markdown-language-features/src/features/previewConfig.ts/MarkdownPreviewConfigurationManager/loadAndCacheConfiguration
class MarkdownPreviewConfigurationManager:	public loadAndCacheConfiguration(
		resource: vscode.Uri
	): MarkdownPreviewConfiguration {
		const config = MarkdownPreviewConfiguration.getForResource(resource);
		this.previewConfigurationsForWorkspaces.set(this.getKey(resource), config);
		return config;
	}