Get events for members of a group

[evelant]

Getting state changes for all members of a group seems like a pretty common use case. For example with motion lighting you probably want to reset a timer if any member of a motion group detects motion but only allow the timer to expire if all members of the group have been off for the whole duration.

Here is a Subflow I developed for doing this, but I'm not sure if it's the best way to go about it. Might it be better to implement this as a feature for the event listener nodes?

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