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* Fix cleaning up metasets
I believe it's a mistake to only delete the metaset if it has a valid controller; see f191f2f5 for where this behavior was introduced.
This is a minimal fix for #9653; as discussed there, it may also be worth updating `updateHoverStyle`.
As of #7030, `this._metasets` should always be defined, so checking whether it's undefined is no longer necessary.
* Add a test covering metaset behavior
* Add a regression test for #9653; fix `toHaveSize` usage
* Fix test failure