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Disclaimer: It's 6:51am. I'm trying to be as understandable as possible. What was happening previously was this: * Press Alt * Extended event generated and processed: state is now Alt down once * Core event generated - keyboard switched: inherited state is Alt down once - event processed: Alt down twice * Release Alt * Extended event generated and processed: state is now null * Core event generated and processed: Alt down once If we switch the order: * Press Alt * Core event generated: - keyboard switched: inherited state is null - event processed: Alt down once * Extended event generated and processed: state is now Alt down once * Release Alt * Core event generated and processed: state is now null * Extended event generated and processed: state is now null When we carry over the previous state, it needs to be the _previous_ state (state and modifiersPerKey), assuming that we're going to catch now-core events for any of these. For example, if Ctrl is held down as we pivot, we need to carry Ctrl over with a count of one, for which an extended + core release will then clear. Carrying over the union of the previous state _and the state resulting from the immediate action_ was what broke things.