MS Word: selection is not reported correctly when using arrows while in "extend selection" mode

[CyrilleB79]

Rewriting more clearly from #3293 what remains to do.

In "extend selection" mode, Word allows to select text using normal navigation commands (arrows, pgUp/Down, home, end, control+arrows, etc.) instead of using these keys combined with shift. When doing so, the selection update is not reported correctly.

Below is an example described in details:

Steps to reproduce:

1. In a blank Word document, write "Hello world!"
2. Put your caret between "l" and "o"
3. Press f8 to enable "extend selection" mode
4. Press f8 again to select "Hello "
5. Press leftArrow
6. Press rightArrow
7. Press escape

Actual behavior:

The following happens:
5. "w" is selected, but "H" is reported
6. "w" is unselected, but "H" is reported

Also, optionally:
3. Nothing is reported
7. Nothing is reported

Expected behavior:

The following should happen:
5. "w selected" should be reported as if shift+leftArrow was pressed
6. "w unselected" should be reported as if shift+rightArrow was pressed

Also, optionally:
3. "Selection mode enabled" should be reported
6. "Selection mode disabled" should be reported

But these two last points are much less critical.

NVDA logs, crash dumps and other attachments:

N/A

System configuration

NVDA installed/portable/running from source:

Installed

NVDA version:

2024.4.1

Windows version:

10

Name and version of other software in use when reproducing the issue:

N/A

Other information about your system:

N/A

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

Not re-tested, but was already present in previous versions.

If NVDA add-ons are disabled, is your problem still occurring?

Yes

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

Yes