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STATUS_GRAPHICS_PATH_ALREADY_IN_TOPOLOGY
The duplicate is an edge in the topology graph
A VidPN present path is the association of one source with one target plus its transformations and support information. This status means the caller tried to add a path that the topology already contains. It is not a report that two monitors show the same desktop; clone arrangements can be valid when represented by distinct target paths.
Look for repeated insertion during topology rebuild, retry logic that did not clear temporary state, or duplicate enumeration of a connector. Compare the exact source/target pair and path identity, not only the human-readable display name.
Diagnose the builder
- Log each path insertion with source ID, target ID, and topology generation.
- Ensure a failed topology build does not leave an old path in the next transaction.
- Use separate handling for a duplicate path and a duplicate mode in a valid mode set.
References
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