subscription_thread_dispatcher: guard against duplicate room events #279

Job	Run time
Detect Changes	5s
Link Check / Link Check	9s
License Check / License Check	3s
Tests / Code Coverage	20m 39s
Builds / Build (linux-x64)	9m 6s
C++ Checks / clang-tidy	11m 49s
Generate Docs / Generate and verify docs	23s
Builds / Build (macos-arm64)	4m 10s
Builds / Build (linux-arm64)	7m 22s
C++ Checks / clang-format	24s
Tests / Test (macos-arm64)	8m 12s
Tests / Test (linux-x64)	7m 40s
Builds / Build (macos-x64)	12m 7s
Tests / Test (macos-x64)	14m 56s
Tests / Test (linux-arm64)	7m 17s
Tests / Test (windows-x64)	14m 58s
Builds / Build (windows-x64)	9m 1s
Rust Release Check	-1s
Docker Images	-1s
CI	5s
	2h 8m 24s

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