fix: incorrect arrow direction in block direction

on-behalf-of: @Mermaid-Chart <hello@mermaidchart.com>

cypress/integration/rendering/block.spec.js

@@ -393,6 +393,27 @@ describe('Block diagram', () => {
   overflow:3
   short:1
   also_overflow:2
+`,
+      {}
+    );
+  });
+
+  it('BL31: edge without arrow syntax should render with no arrowheads', () => {
+    imgSnapshotTest(
+      `block-beta
+  a
+  b
+  a --- b
+`,
+      {}
+    );
+  });
+  it('BL32: edge with arrow syntax should render with arrowheads', () => {
+    imgSnapshotTest(
+      `block-beta
+  a
+  b
+  a --> b
 `,
       {}
     );

packages/mermaid/src/diagrams/block/blockDB.ts

@@ -238,13 +238,15 @@ export function edgeTypeStr2Type(typeStr: string): string {
 }
 
 export function edgeStrToEdgeData(typeStr: string): string {
-  switch (typeStr.trim()) {
+  switch (typeStr.replace(/^[\s-]+|[\s-]+$/g, '')) {
-    case '--x':
+    case 'x':
       return 'arrow_cross';
-    case '--o':
+    case 'o':
       return 'arrow_circle';
-    default:
+    case '>':
       return 'arrow_point';
+    default:
+      return '';
   }
 }