Allow Windows Magnifier to follow NVDA virtual cursor

[CyrilleB79]

Is your feature request related to a problem? Please describe.

As a visually impaired person, I am using NVDA in conjunction with Windows Magnifier.
That works quite smoothly in applications such as Windows Explorer or text editors, since the magnified view follows the caret or the focus.
However on the web, the magnified view does not follow the virtual cursor (browse mode cursor) and what is read by NVDA often cannot be seen on the screen, unless an element making the focus move is encountered (e.g. a link).
I did not test recently, but I think the same issue occurs with Zoomtext and probably with other magnification tools.

Describe the solution you'd like

NVDA should inform the Magnifier of its virtual cursor's location so that the magnified view can follow it.
Note that Windows Magnifier follows the narrator's cursor on the web.

Describe alternatives you've considered

None

Additional context

N/A

Notes

• Cc @LeonarddeR maybe you have any pointer to deal with this issue. Especially, I guess that there may be some sort of API to inform the ATs of the location of the cursor.
• This issue may partially blocked by Say all, move caret per word instead of per line/sentence, taken over after abandoned 9937 #11658. However this would already be beneficial to have the magnified view updated for each line/sentence. Cc @FalkoBabbage, @lukaszgo1 who commented in this other issue.

[LeonarddeR]

The vision framework should offer you everything you need as long as there is an option to tell the windows magnifier the virtual cursor position (like with Narrator. However, I'm afraid this is a private API only Narrator is allowed to access, or it is the magnifier that accesses Narrator, I don't know.