subscription_thread_dispatcher: guard against duplicate room events #269

Job	Run time
Detect Changes	6s
License Check / License Check	4s
Link Check / Link Check	7s
Tests / Code Coverage	18m 13s
C++ Checks / clang-format	19s
C++ Checks / clang-tidy	12m 16s
Tests / Test (linux-x64)	6m 39s
Builds / Build (windows-x64)	9m 56s
Tests / Test (macos-arm64)	6m 9s
Builds / Build (linux-x64)	8m 50s
Builds / Build (linux-arm64)	7m 54s
Builds / Build (macos-x64)	13m 46s
Generate Docs / Generate and verify docs	29s
Tests / Test (macos-x64)	14m 51s
Tests / Test (windows-x64)	15m 5s
Builds / Build (macos-arm64)	4m 30s
Tests / Test (linux-arm64)	9m 37s
Docker Images	0s
Rust Release Check	0s
CI	4s
	2h 8m 55s

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