Tidy up `MixerChannelView` #3959

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Run time

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Job	Run time
linux	12m 59s
macos-x86_64	14m 37s
mingw32	13m 7s
msvc-x86	13m 11s
macos-arm64	9m 10s
mingw64	14m 26s
msvc-x64	12m 12s
	1h 29m 42s