Accessibility: Orca does not announce mount-point autocomplete options in manual partition dialog

[abdallhMoukdad]

Is there an existing issue for this?

• I have searched the existing issues and found none matching what I'm reporting.

Bug Description

In the manual partition dialog, Orca does not announce mount-point autocomplete suggestion values (for example /boot, /home) when navigating the suggestion list with keyboard.

This was discovered during manual verification for #1246 (dropdown semantics).

Steps to reproduce the behavior

1. Launch installer in dry-run mode.
2. Go to Manual partitioning.
3. Select free space and open Create partition.
4. Focus the Mount point field.
5. Type / so autocomplete suggestions appear.
6. Use keyboard navigation (for example Down Arrow) to move through suggestions.
7. Observe Orca output.

Expected behavior

When moving through mount-point suggestions, Orca should announce the currently focused suggestion value (e.g. /boot, /home) and selection changes.

Ubuntu release

Other (specify in the last field)

What architecture are you using?

amd64

System info

Observed on Ubuntu 25.10 installer testing.

Additional context

• Related to accessibility behavior in manual partitioning dialogs.
• Kept separate from Accessibility: Flutter-based Ubuntu Installer dropdown menus are not readable by Orca during manual disk partitioning on ubuntu 25.10 #1246 so dropdown-selector scope remains clean.

[abdallhMoukdad]

I found this while manually verifying #1246 and can work on a fix in a follow-up PR.\n\nIf this is already assigned or in progress, please let me know and I will coordinate accordingly.