Regression in Groups: when viewing and old chat tab, landscape just spinners instead of preserving content

[ynx0]

Describe the bug Title. This happens to me on mobile using safari

To Reproduce Steps to reproduce the behavior:

1. Go to a chat
2. Scroll up a few messages just for fun
3. Use a different app
4. Come back and see spinner

Expected behavior Old message log view is preserved.

Operating context

• Device: iPhone
• OS: iOS 14
• Browser safari
• Landscape Version q5vio

[liam-fitzgerald]

This is deliberate, to prevent stale data from irregularly setting unread counts and otherwise creating a janky user experience by loading in chat messages out of order. However, this behaviour should be reworked so that the subscription to graph-store occurs on a per-graph basis. With this, we would be able to restrict wiping graphs only when their subscriptions clog. Because clogs are per-subscription, the clogs would also be rarer. This would reduce the frequency of this behaviour, which I agree is highly irritating

[jamesacklin]

Good to do for someone to get exposure to subscription handlers.