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)



}
    const popup = new PopupElement({
      container: this.container,
      trigger: Array.from(parentElements),
      color: this.data.color,
      titleObj: this.data.titleObj,
      modificationDate: this.data.modificationDate,
      contentsObj: this.data.contentsObj,
    });
    
    
    const page = this.page;
    const rect = Util.normalizeRect([
      this.data.parentRect[0],
      page.view[3] - this.data.parentRect[1] + page.view[1],
      this.data.parentRect[2],
      page.view[3] - this.data.parentRect[3] + page.view[1],
    ]);
    const popupLeft =
      rect[0] + this.data.parentRect[2] - this.data.parentRect[0];
    const popupTop = rect[1];
    this.container.style.transformOrigin = `${-popupLeft}px ${-popupTop}px`;
    this.container.style.left = `${popupLeft}px`;
    this.container.style.top = `${popupTop}px`;
    this.container.appendChild(popup.render());
    return this.container;
  }
}
class PopupElement {
  constructor(parameters) {