fix(installer): prevent issues with deferred properties containing semi-colons

[Richard Markiewicz (thenextman)]

WiX encodes multiple properties in custom action data separated by a semi-colon; this is problematic if a property value itself contains a semi-colon. Most visibly this will break the installer if a certificate password contains a semi-colon.

[github-actions]

Let maintainers know that an action is required on their side

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[Copilot]

Pull request overview

This PR updates the Windows MSI installer property-passing mechanism to avoid failures when deferred custom action data contains semicolons by introducing Base64-encoded “shadow” properties (*_ENCODED) for selected string properties.

Changes:

• Added Encode support to IWixProperty/WixProperty<T> plus session helpers to Base64 encode/decode string properties.
• Updated the property generator to emit additional *_ENCODED properties and to mark selected properties as encode: true.
• Added an immediate EncodePropertyData action and updated deferred action property mapping to pass encoded property IDs.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
package/WindowsManaged/Properties/WixProperty.cs	Adds Encode/Decode helpers and Encode flag on properties.
package/WindowsManaged/Properties/GatewayProperties.g.tt	Extends generator to emit Encode metadata and *_ENCODED properties; marks some properties as encoded.
package/WindowsManaged/Properties/GatewayProperties.g.cs	Regenerated output reflecting Encode and *_ENCODED properties.
package/WindowsManaged/Actions/GatewayActions.cs	Adds EncodePropertyData action and passes encoded property IDs in UsesProperties.
package/WindowsManaged/Actions/CustomActions.cs	Uses Decode for encoded properties and adds the EncodePropertyData custom action.

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[Richard Markiewicz (thenextman)]

Don't know what's going on with CI 🤷

[Benoît Cortier (CBenoit)]

Looks like it’s not happy with Rust formatting… which is strange since you changed nothing 🤷
Let me check that!