fix(parser): support Mermaid v11 subgraph IDs and parse newlines correctly

Author: tamld

src/parser/flowchart.ts

@@ -200,7 +200,7 @@ const parseSubGraph = (
 
   // Get position
   const el: SVGSVGElement | null = containerEl.querySelector(
-    `[id='${data.id}']`
+    `[id*='${data.id}']`
   );
   if (!el) {
     throw new Error("SubGraph element not found");

src/utils.ts

@@ -8,7 +8,9 @@ export const entityCodesToText = (input: string): string => {
   // eg #9829; => ♥
   const inputWithDecimalCode = input
     .replace(/#(\d+);/g, "&#$1;")
-    .replace(/#([a-z]+);/g, "&$1;");
+    .replace(/#([a-z]+);/g, "&$1;")
+    .replace(/\\n/g, "\n")
+    .replace(/<br\s*\/?>/gi, "\n");
 
   // Render the decimal code as html character, eg &#9829; => ♥
   const element = document.createElement("textarea");