Restore UI Automation support for custom accessible controls - #11875
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System.Windows.Automation replaces the Windows MSAA proxy with its own client-side provider. That provider ignores richer patterns, properties, and property-change events exposed through IAccessibleEx. Compose server support before legacy inference, preserve existing fallbacks, and bridge ExpandCollapse and Toggle state events. Retain valid Tree selection contracts. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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System.Windows.Automationclients replace Windows' MSAA proxy with a legacy managed provider that ignores richer patterns and properties exposed throughIAccessibleEx. Custom controls therefore lose pattern support, set-position metadata, and pattern state notifications that native UI Automation clients receive.This change honors server-provided patterns and properties before legacy MSAA inference, bridges
ExpandCollapseandTogglestate events, preserves existing fallbacks for unsupported members, and provides valid Tree selection contracts.Microsoft Reviewers: Open in CodeFlow