subscription_thread_dispatcher: guard against duplicate room events #277

Job	Run time
Detect Changes	8s
Link Check / Link Check	8s
License Check / License Check	5s
C++ Checks / clang-format	17s
C++ Checks / clang-tidy	11m 32s
Generate Docs / Generate and verify docs	27s
Builds / Build (macos-x64)	13m 3s
Builds / Build (linux-arm64)	7m 41s
Builds / Build (macos-arm64)	4m 21s
Builds / Build (linux-x64)	8m 58s
Tests / Code Coverage	17m 51s
Tests / Test (linux-arm64)	7m 27s
Tests / Test (macos-arm64)	6m 49s
Tests / Test (linux-x64)	11m 23s
Builds / Build (windows-x64)	9m 32s
Tests / Test (windows-x64)	13m 18s
Tests / Test (macos-x64)	14m 44s
Docker Images	0s
Rust Release Check	0s
CI	4s
	2h 7m 48s

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