When QuickLookUI is open, rotating device causes it to be dismissed

[boscojwho]

Describe the bug

Expected Behavior

1. Open photo in Feed.
2. Rotate device.
3. QuickLookUI rotates photo.
4. User continues interacting with QuickLookUI.

Actual Behavior

1. Open photo in Feed.
2. Rotate device.
3. QuickLookUI sheet is dismissed.

To Reproduce
This happens when opening QuickLookUI from Feed view, but not Post view.

• It doesn't happen if Feed isn't scrolled down past a few posts.

Mlem Information:
Latest public TestFlight build and latest dev build.

Additional Context

Simulator.Screen.Recording.-.iPhone.15.Pro.-.2023-11-04.at.22.37.43.mp4

[boscojwho]

This issue is caused by FeedView not respecting scroll position on device rotation.

• Currently, QuickLookUI is presented as a fullscreen sheet on the CachedImage view that trigger its opening.
• This view is associated with a cell in the FeedView.
• On device rotation, FeedView's lazy v stack moves to a different scroll position, and causes the CachedImage view that presented the QuickLookUI to disappear.
• Since the view that presented it disappeared, SwiftUI removes the fullscreen sheet QuickLookUI from view.

We can confirm this by presenting QuickLookUI on a parent view (i.e. FeedView):

• Doing so resolves this bug.

I'm not proposing we move the sheet to a parent view (for now, at least).

[EricBAndrews]

Closed in #756