1fbd7c7124e60a07bc99290272dcaf211eecabc9
the code was first clearing the entire Editor selection before adding the region, causing every note selection to trigger the RegionsChanged pathway. This is crazy expensive for some reason (more than 8.12) and that should be investigated, but the logic is also wrong. Selecting a region that is alrready the sole selected region should not cause any action at all.
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