TrackBar control does not support UIA accessibility

[SergeySmirnov-Akvelon]

Environment

• Microsoft Windows [Version 10.0.19041.388]
• .NET Core SDK 6.0.100-preview.3.21202.5

Have you experienced this same bug with .NET Framework?:

• Yes

Problem description

Accessibility providers:
[pid:9884,providerId:0x280FE0 Main:Nested [pid:28360,providerId:0x280FE0 Main(parent link):Microsoft: MSAA Proxy (unmanaged:UIAutomationCore.dll)]; Nonclient:Microsoft: Non-Client Proxy (unmanaged:uiautomationcore.dll); Hwnd(parent link):Microsoft: HWND Proxy (unmanaged:uiautomationcore.dll)]

Expected behavior:
There should be UIA accessibility provider from WinForms.

Minimal repro:
Create WinForms app with TrackBar control and analyze it using Inspect.

Related item:
This work item is the sub of #3037

[John-Qiao]

Verified with .NET 6.0.100-rc.1.21368.3 from main branch, this issue has been fixed that TrackBar control supports the UIA accessibility now.

[John-Qiao]

Verified with .NET 6.0.100-preview.7.21369.19 build, this issue has been fixed that TrackBar control supports the UIA accessibility too.