Fixed wrong ELK detector

packages/mermaid-flowchart-elk/src/detector.spec.ts

@@ -39,6 +39,26 @@ describe('flowchart-elk detector', () => {
     ).toBe(true);
   });
 
+  // The error from the issue was reproduced with mindmap, so this is just an example
+  // what matters is the keyword somewhere inside graph definition
+  it('should check only the beginning of the line in search of keywords', () => {
+    expect(
+      detector('mindmap ["Descendant node in flowchart"]', {
+        flowchart: {
+          defaultRenderer: 'elk',
+        },
+      })
+    ).toBe(false);
+
+    expect(
+      detector('mindmap ["Descendant node in graph"]', {
+        flowchart: {
+          defaultRenderer: 'elk',
+        },
+      })
+    ).toBe(false);
+  });
+
   it('should detect flowchart-elk', () => {
     expect(detector('flowchart-elk')).toBe(true);
   });

packages/mermaid-flowchart-elk/src/detector.ts

@@ -11,7 +11,7 @@ const detector: DiagramDetector = (txt, config): boolean => {
     // If diagram explicitly states flowchart-elk
     /^\s*flowchart-elk/.test(txt) ||
     // If a flowchart/graph diagram has their default renderer set to elk
-    (/^\s*flowchart|graph/.test(txt) && config?.flowchart?.defaultRenderer === 'elk')
+    (/^\s*(flowchart|graph)/.test(txt) && config?.flowchart?.defaultRenderer === 'elk')
   ) {
     return true;
   }