GeezerVison

Backport of #28275 to release/v7.7.0

Triggered by Justin Chung (@jshigetomi) on behalf of OKAN TIKTAS (@OKAN-SOFTWARE)

Original CL Label: CL-BuildPackaging

/cc @PowerShell/powershell-maintainers

Impact

REQUIRED: Choose either Tooling Impact or Customer Impact (or both). At least one checkbox must be selected.

Tooling Impact

• Required tooling change
• Optional tooling change (include reasoning)

Updates the shipped MSIX/Appx packaging manifest to opt into deferred updates while PowerShell is running. This packaging change is required for Store-delivered builds to provide the intended update behavior.

Customer Impact

• Customer reported
• Found internally

Addresses #28272: Microsoft Store updates can terminate running PowerShell sessions, interrupting active commands and long-running processes. On supported Windows versions, the MSIX manifest setting instructs Windows to defer updates until the application restarts or the system reboots.

Regression

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• Yes
• No

This is not a regression.

Testing

The original PR reports successful git diff --check, XML parsing, verification that UpdateWhileInUse is defer in the correct namespace, and inclusion of uap17 in IgnorableNamespaces. The backport cherry-picked without conflicts. End-to-end Store update and deployment validation were not performed; backport CI must pass before merge.

Risk

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• High
• Medium
• Low

Changes MSIX update behavior through a packaging manifest setting. The change registers uap17 as an ignorable namespace and preserves the existing minimum supported Windows version; end-to-end Store update and deployment behavior still require validation.