Browser extension doesn't render code-intel popovers in the new file view on GitHub

[taras-yemets]

• Sourcegraph version: 5.0
• Platform information: Sourcegraph for Chrome & Firefox 23.3.10.1712, Safari 1.23

Steps to reproduce:

1. Ensure Sourcegraph browser extension is enabled.
2. Ensure the new code view feature preview is enabled.
3. Open a file on GitHub and hover over tokens.

https://user-images.githubusercontent.com/25318659/231468328-88808c24-7563-49bd-9f8b-1f065e1140b4.mov

Expected behavior:

Hovering over any interactive token triggers code-intel popover.

Actual behavior:

Code-intel popover is not rendered.

If you would like immediate help on this, please email support@sourcegraph.com (you can still create the issue, but there are no SLAs on issues like there are for support requests).

[taras-yemets]

Due to a recent change in the new code view on GitHub (blob navigation cursor addition and possibly a new editor to power the blob view) Sourcegraph browser extension doesn't render the code-intel popovers for this kind of code view.

• The browser extension relies on the blob view markup when defining the hover position (domFunctions.ts).
• With the DOM structure on the screenshot above, all hover events are captured on the texarea element; the element below it (in red rectangular) has pointer-events set to none and thus is not a target for any pointer events. Thus we can't use the latter to define the token position (line and char numbers).
• Setting pointer-events to auto on the container with lines breaks the symbols sidebar.