Fix: Perform view updates during scroll tracking

[sgade]

Thank you for providing this great package, @scenee. We have been using it in our app for years now, since it is the best solution for panels below the tab bar.
We used to use the SwiftUI implementation from some issue thread, IIRC, but are currently switching to version 3.2.0 with official SwiftUI support. Thereby noticing this issue reappear:

When we enable floatingPanelScrollTracking on our view inside of the floating panel, some view updates are performed (i.e., SwiftUI views are being instantiated) but no rendering (i.e., body evaluations) occurs.

Example code:

content
    .floatingPanel(
        coordinator: ContentPanelCoordinator.self,
        onEvent: onEvent
    ) { proxy in
        panelContent
            .floatingPanelScrollTracking(proxy: proxy) // scroll tracking breaks view updates
    }

We tracked this down to the scroll tracking, and it seems that the performing of view updates inside of the ScrollViewRepresentable was missing.

This seems similar to #675.

[scenee]

Thank you for the kind words, I really appreciate it! 😄
You are spot on! I totally missed that. Thank you so much for pointing it out.