extensions/markdown-language-features/src/features/preview.ts/MarkdownPreview/onDidScrollPreview
class MarkdownPreview:	private onDidScrollPreview(line: number) {
		this.line = line;
		this._onScrollEmitter.fire({ line: this.line, uri: this._resource });
		const config = this._previewConfigurations.loadAndCacheConfiguration(this._resource);
		if (!config.scrollEditorWithPreview) {
			return;
		}

		for (const editor of vscode.window.visibleTextEditors) {
			if (!this.isPreviewOf(editor.document.uri)) {
				continue;
			}

			this.isScrolling = true;
			scrollEditorToLine(line, editor);
		}
	}