Attach (recommended) or Link to PDF file here:
[test planning.pdf](https://github.com/mozilla/pdf.js/files/7305078/test.planning.pdf)

Configuration:
- Web browser and its version: Firefox 93
- Operating system and its version: Windows 10 21H2
- PDF.js version: The integrated version
- Is a browser extension: no

Steps to reproduce the problem:
1. In the example, all shape and the "Line" cell of the first cell have a comment
2. Mouse over a "Line" cell or a shape, nothing appear except on mouse over their border
3. It is too difficult to use
4. There is also a vertical orientation issue reported in bug #7631

What is the expected behavior? (add screenshot)
Comments are shown on mouse hover or mouse click inside a cell or a shape

What went wrong? (add screenshot)
Comments are not shown when mouse hover or clicking inside a cell or a shape, only on their border

![image](https://user-images.githubusercontent.com/7791600/136419088-e083e2a3-d376-4d8c-9e0b-ce9dd5b83923.png)



}
      },
      bgColor: event => {
        setColor("bgColor", "backgroundColor", event);
      },
      fillColor: event => {
        setColor("fillColor", "backgroundColor", event);
      },
      fgColor: event => {
        setColor("fgColor", "color", event);
      },
      textColor: event => {
        setColor("textColor", "color", event);
      },
      borderColor: event => {
        setColor("borderColor", "borderColor", event);
      },
      strokeColor: event => {
        setColor("strokeColor", "borderColor", event);
      },
    };
    for (const name of Object.keys(jsEvent.detail)) {
      const action = actions[name] || commonActions[name];
      if (action) {
        action(jsEvent);
      }
    }
  }
}
class TextWidgetAnnotationElement extends WidgetAnnotationElement {