fix: Improve workspace comment keyboard navigation behavior. (#9211)

* fix: Prevent tabbing into workspace comments.

* fix: Focus workspace comments when navigating to them using the keyboard.

Author: gonfunko

core/comments/comment_editor.ts

@@ -52,6 +52,7 @@ export class CommentEditor implements IFocusableNode {
       dom.HTML_NS,
       'textarea',
     ) as HTMLTextAreaElement;
+    this.textArea.setAttribute('tabindex', '-1');
     dom.addClass(this.textArea, 'blocklyCommentText');
     dom.addClass(this.textArea, 'blocklyTextarea');
     dom.addClass(this.textArea, 'blocklyText');

core/keyboard_nav/line_cursor.ts

@@ -401,6 +401,8 @@ export class LineCursor extends Marker {
       block.workspace.scrollBoundsIntoView(
         block.getBoundingRectangleWithoutChildren(),
       );
+    } else if (newNode instanceof RenderedWorkspaceComment) {
+      newNode.workspace.scrollBoundsIntoView(newNode.getBoundingRectangle());
     }
   }