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Implement the target-wide `CXX_SCAN_FOR_MODULES`/`CMP0155` selection with the `.vcxproj`-wide `ScanSourceForModuleDependencies` setting. Set the per-source equivalent only when needed for a per-source `CXX_SCAN_FOR_MODULES` property. This approach enables Intellisense for interfaces imported from modules. It is also more consistent with what a user might expect when investigating the state of module scanning from the VS property panels. Fixes: #25806 Fixes: #25947
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