extensions/markdown-language-features/src/features/previewConfig.ts/MarkdownPreviewConfigurationManager/hasConfigurationChanged
class MarkdownPreviewConfigurationManager:	public hasConfigurationChanged(
		resource: vscode.Uri
	): boolean {
		const key = this.getKey(resource);
		const currentConfig = this.previewConfigurationsForWorkspaces.get(key);
		const newConfig = MarkdownPreviewConfiguration.getForResource(resource);
		return (!currentConfig || !currentConfig.isEqualTo(newConfig));
	}