#5237 Fix of label styling

cypress/integration/rendering/appli.spec.js

@@ -11,6 +11,27 @@ describe('Git Graph diagram', () => {
       {}
     );
   });
+  it('Should render subgraphs with title margins and edge labels', () => {
+    imgSnapshotTest(
+      `flowchart LR
+
+          subgraph TOP
+              direction TB
+              subgraph B1
+                  direction RL
+                  i1 --lb1-->f1
+              end
+              subgraph B2
+                  direction BT
+                  i2 --lb2-->f2
+              end
+          end
+          A --lb3--> TOP --lb4--> B
+          B1 --lb5--> B2
+        `,
+      { flowchart: { subGraphTitleMargin: { top: 10, bottom: 5 } } }
+    );
+  });
   // it(`ultraFastTest`, function () {
   //   // Navigate to the url we want to test
   //   // ⭐️ Note to see visual bugs, run the test using the above URL for the 1st run.

cypress/integration/rendering/stateDiagram-v2.spec.js

@@ -581,6 +581,20 @@ style AState fill:#636,border:1px solid red,color:white;
         { logLevel: 0, fontFamily: 'courier' }
       );
     });
+    it(' should allow styles to take effect in stubgraphs', () => {
+      imgSnapshotTest(
+        `
+  stateDiagram
+    state roundWithTitle {
+      C: Black with white text
+    }
+    D: Black with white text
+
+    style C,D stroke:#00f, fill:black, color:white
+        `,
+        { logLevel: 0, fontFamily: 'courier' }
+      );
+    });
   });
   it('1433: should render a simple state diagram with a title', () => {
     imgSnapshotTest(