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Interesting... so just the fact that these event handlers were being wired up in firstUpdated was somehow causing an extra update cycle?
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They were not, the rest of the firstUpdate code was, so we could keep them on firstUpdated but it would be the only thing there. And anyways, I believe this fits better with the recommended pattern for lit event handling.
The examples on that page define internal listeners on the constructor but does not explicitly recommend that approach. It does however explicitly recommend that external listeners (e.g. for window or other components) would be defined on connectedCallback, so might as well define internal listeners here too.
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Note: we have some best practices for this in the Daylight docs with explanation which I believe aligns with the Lit documentation.
While handlers on this can be managed from connected/disconnectedCallback, wiring up in that lifecycle method really just preferred when wiring up handlers to external elements. Wiring up to this in firstUpdated or the constructor simplifies managing it. There's the perf things too, but I think it is probably negligible.
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GAUD-9526