fix: align branch label background with text for multi-line labels in LR GitGraph

.changeset/fix-gitgraph-branch-label-alignment.md

@@ -0,0 +1,5 @@
+---
+'mermaid': patch
+---
+
+fix: Align branch label background with text for multi-line labels in LR GitGraph layout

cypress/integration/rendering/gitGraph.spec.js

@@ -2164,4 +2164,19 @@ gitGraph TB:
       );
     });
   });
+
+  it('97: should render branch labels with multi-line text aligned with background in LR layout', () => {
+    imgSnapshotTest(
+      `gitGraph LR:
+         commit id: "1"
+         branch "Feature A\n(ongoing)"
+         commit id: "2"
+         commit id: "3"
+         checkout main
+         commit id: "4"
+         commit id: "5"
+      `,
+      {}
+    );
+  });
 });

packages/mermaid/src/diagrams/git/gitGraphRenderer.ts

@@ -877,7 +877,7 @@ const drawBranches = (
       bkg.attr('x', pos - bbox.width / 2 - 10).attr('y', maxPos);
       label.attr('transform', 'translate(' + (pos - bbox.width / 2 - 5) + ', ' + maxPos + ')');
     } else {
-      bkg.attr('transform', 'translate(' + -19 + ', ' + (pos - bbox.height / 2) + ')');
+      bkg.attr('transform', 'translate(' + -19 + ', ' + (pos - 11) + ')');
     }
   });
 };