Add toggle to hide empty state in devtools

[toger5]

This is helpful for when shwoing m.rtc.member events. They are empty if the person is left. With this option we can easily filter for only non-empty events to save time to clean room state. (It is also helpful for any other task where we want to investigate the room state and are interested in only joined members / want to know if a member is joined)

Checklist

• Tests written for new code (and old code if feasible).
• New or updated public/exported symbols have accurate TSDoc documentation.
• Linter and other CI checks pass.
• I have licensed the changes to Element by completing the Contributor License Agreement (CLA)

[robintown]

Nice, this will be really convenient.

[t3chguy]

Personally not sure seeing half the state updates is helpful for most things, like only seeing space children added but not removed would be confusing and form half a view of reality, if anything maybe it should be per-room

[toger5]

Personally not sure seeing half the state updates is helpful for most things, like only seeing space children added but not removed would be confusing and form half a view of reality, if anything maybe it should be per-room

This is about the state in the state list. So it does not effect state changes but only filters current state in the modal state key list.
(I might misunderstand your comment?)

[t3chguy]

Ah okay, my bad, I thought it augmented "Show hidden events" - my mistake for reviewing without caffeine