Fix mixer `EffectRackView` GUI glitch #3751

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Run time

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Job	Run time
linux	6m 46s
msvc-x86	6m 44s
mingw32	6m 44s
macos-x86_64	6m 57s
msvc-x64	6m 45s
mingw64	6m 43s
macos-arm64	6m 58s
	47m 37s