Fix ListView Details view cell retrieval and full-row accessibility

[LeafShi1]

Fixes #15044

Root Cause

ListView in Details view advertises UIA Grid and Table patterns but did not override GridPattern.GetItem(row, column). The base implementation returned null, even though the corresponding cell existed in the UIA tree.

Additionally, full-row mouse hit testing returned individual cells while selection events targeted the row, resulting in incomplete announcements.

Proposed changes

• Implement GridPattern.GetItem(row, column) for ListView in Details view so it returns the correct cell accessible object.
• For full-row selection, expose all column values through the row accessible name.

Customer Impact

• JAWS, NVDA, Narrator, and other UIA clients can correctly read and navigate every column in Details-mode ListViews.

Regression?

• No

Risk

• Minimal

Screenshots

Before

GridPattern.GetItem() returned an empty provider. Screen readers generally announced only the first column.

Accessibility Insights:

BeforeFix.mp4

NVDA：

Narrator：

After

GridPattern.GetItem(row, column) returns the correct cell accessible object. Screen readers can read all columns in a Details-view ListView.

Accessibility Insights:

AfterFix.mp4

NVDA：

Narrator：

Test methodology

• Unit test and manual test

Test environment(s)

• .net 11.0.0-beta.26453.118

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.24166%. Comparing base (f0cd8e4) to head (4d90214).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##                main      #15056   +/-   ##
=============================================
  Coverage   37.24166%   37.24166%           
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  Files            246         246           
  Lines           9774        9774           
  Branches        1029        1029           
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  Hits            3640        3640           
  Misses          5970        5970           
  Partials         164         164           

Flag	Coverage Δ
Debug	37.24166% <ø> (ø)
production	39.36526% <ø> (ø)
test	20.64923% <ø> (ø)
unit	39.36526% <ø> (ø)

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[Copilot]

🟡 Changes recommended

The new FullRowSelect Name logic can drop the base item text (e.g., when there are zero columns) and has avoidable side effects/allocations that should be addressed before merging.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Fixes UIA Grid/Table behavior for ListView in View.Details by returning real cell providers from GridPattern.GetItem(row, column), and improves full-row selection announcements by including all column values in the row accessible name.

Changes:

• Override ListViewAccessibleObject.GetItem(row, column) to return the correct sub-item accessible object in Details view.
• Update Details-view item accessible Name for FullRowSelect to surface all column values.
• Add a unit test covering GetItem(row, column) returning the expected sub-item provider.

File summaries

File	Description
src/test/unit/System.Windows.Forms/System/Windows/Forms/AccessibleObjects/ListVIew.ListViewAccessibleObjectTests.cs	Adds a regression test for ListViewAccessibleObject.GetItem in Details view (with/without images).
src/System.Windows.Forms/System/Windows/Forms/Controls/ListView/ListViewItem.ListViewItemDetailsAccessibleObject.cs	Changes the accessible row Name behavior for FullRowSelect in Details view.
src/System.Windows.Forms/System/Windows/Forms/Controls/ListView/ListView.ListViewAccessibleObject.cs	Implements GridPattern.GetItem(row, column) for Details-mode ListView.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 2
• Review effort level: Lite

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