Tidy up `MixerChannelView` #3956

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Run time

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Job	Run time
linux	13m 5s
msvc-x86	13m 18s
mingw32	12m 42s
macos-x86_64	16m 45s
msvc-x64	13m 28s
mingw64	15m 4s
macos-arm64	10m 28s
	1h 34m 50s