fix: disposing workspace comments. (#7264)

* fix: disposing workspace comments.

* whitespace formatting

core/workspace_comment_svg.ts

@@ -144,8 +144,6 @@ export class WorkspaceCommentSvg
     }
 
     dom.removeNode(this.svgGroup);
-    // Dispose of any rendered components
-    this.disposeInternal();
 
     eventUtils.disable();
     super.dispose();
@@ -989,11 +987,6 @@ export class WorkspaceCommentSvg
     this.resizeComment();
   }
 
-  /** Dispose of any rendered comment components. */
-  private disposeInternal() {
-    this.disposed_ = true;
-  }
-
   /**
    * Set the focus on the text area.
    *

tests/mocha/workspace_comment_test.js

@@ -6,7 +6,6 @@
 
 goog.declareModuleId('Blockly.test.workspaceComment');
 
-import {WorkspaceComment} from '../../build/src/core/workspace_comment.js';
 import {
   sharedTestSetup,
   sharedTestTeardown,
@@ -166,6 +165,19 @@ suite('Workspace comment', function () {
       // Nothing should go wrong the second time dispose is called.
       comment.dispose();
     });
+
+    test('WorkspaceCommentSvg disposed', function () {
+      const comment = new Blockly.WorkspaceCommentSvg(
+        this.workspace,
+        'comment text',
+        0,
+        0,
+        'comment id'
+      );
+      comment.dispose();
+      // Nothing should go wrong the second time dispose is called.
+      comment.dispose();
+    });
   });
 
   suite('Width and height', function () {