Add robust system to determine when a pane is being displayed in the most recent place

[alexvanyo]

No description provided.

[alexvanyo]

Extremely rough idea:

Remember a history mapping of each pane id to the nested pane hierarchy it most recently appeared in.

When computing a pane transform, update the map with the updated pane hierarchy, leaving unused panes untouched.

When deciding to render a pane, check if its location in the pane transform hierarchy matches the map's entry.

Since this is hierarchical there probably would need to be some sort of CompositionLocal that either filters the map, or provides the breadcrumb trail of pane ids to query the map for.