fix for broken katex,state,error spec

packages/mermaid/src/diagrams/flowchart/flowRenderer-v3-unified.ts

@@ -51,7 +51,7 @@ export const draw = async function (text: string, id: string, _version: string,
   await render(data4Layout, svg, element);
   const padding = data4Layout.config.flowchart?.padding ?? 8;
   utils.insertTitle(
-    element,
+    svg,
     'flowchartTitleText',
     conf?.titleTopMargin || 0,
     diag.db.getDiagramTitle()

packages/mermaid/src/rendering-util/createText.ts

@@ -216,9 +216,13 @@ export const createText = async (
 
     const htmlText = markdownToHTML(text, config);
     const decodedReplacedText = replaceIconSubstring(decodeEntities(htmlText));
+
+    //for Katex the text could contain escaped characters, \\relax that should be transformed to \relax
+    const inputForKatex = text.replace(/\\\\/g, '\\');
+
     const node = {
       isNode,
-      label: decodedReplacedText,
+      label: hasKatex(text) ? inputForKatex : decodedReplacedText,
       labelStyle: style.replace('fill:', 'color:'),
     };
     const vertexNode = await addHtmlSpan(el, node, width, classes, addSvgBackground);