subscription_thread_dispatcher: guard against duplicate room events #280

Job	Run time
Detect Changes	7s
License Check / License Check	5s
Link Check / Link Check	6s
Tests / Code Coverage	17m 27s
Generate Docs / Generate and verify docs	34s
C++ Checks / clang-tidy	11m 45s
Tests / Test (macos-arm64)	7m 54s
C++ Checks / clang-format	21s
Builds / Build (linux-arm64)	7m 48s
Tests / Test (linux-x64)	10m 44s
Tests / Test (windows-x64)	15m 2s
Tests / Test (macos-x64)	14m 56s
Builds / Build (macos-x64)	13m 36s
Builds / Build (linux-x64)	8m 39s
Tests / Test (linux-arm64)	9m 9s
Builds / Build (windows-x64)	9m 28s
Builds / Build (macos-arm64)	4m 38s
Docker Images	0s
Rust Release Check	0s
CI	4s
	2h 12m 23s

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