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)



link.href = this.linkService.getAnchorUrl("");
    const map = new Map([
      ["Action", "onclick"],
      ["Mouse Up", "onmouseup"],
      ["Mouse Down", "onmousedown"],
    ]);
    for (const name of Object.keys(data.actions)) {
      const jsName = map.get(name);
      if (!jsName) {
        continue;
      }
      link[jsName] = () => {
        this.linkService.eventBus?.dispatch("dispatcheventinsandbox", {
          source: this,
          detail: {
            id: data.id,
            name,
          },
        });
        return false;
      };
    }
    if (!link.onclick) {
      link.onclick = () => false;
    }
    link.className = "internalLink";
  }
  _bindResetFormAction(link, resetForm) {