libobs: Monitoring deduplication fix for 'Desktop Audio' on monitor_only #12917
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Description
When an Audio Output Capture source (AOC) like 'Desktop Audio' has monitoring_type == OBS_MONITORING_TYPE_MONITOR_ONLY, deduplication should not be triggered. this is an edge case which may not cover a reasonable use case, but for the sake of completeness, we deal with it.
Motivation and Context
Bug fix reported by @Penwy
How Has This Been Tested?
Bug is fixed on windows 11 25 H2.
Deduplication is not triggered if AOC is monitor_only.
Tested on a sine signal: the level stays nominal.
Types of changes
Checklist: