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02f64a43a5
+ Added a new row type for outliner trees that sets the background color once for the whole row. Previously this logic was implemented by each widget within the row (now each column widget, and the outliner view widget), which meant we re-ran the exact same logic (that was copied around) for background color computation multiple times per row. We now only do this once for the whole row.
+ Added a ModelID to all MVVM models. This is just a non-persistent serial uint32 unique to the instance and can be used for more efficient and stable keys than using the instance ptr.
+ SharedData is now a view model so it can support arbitrary extension and casting. This enables us to:
+ Add a new hierarchical cache extension that is easily accessible from any widget using GetSharedData()->CastThis<FOutlinerCacheExtension>()
+ Hierarchical Cache will perform a single pass on the entire MVVM hierarchy and allow clients to compute cached flags.
+ We have a separate cache for each of mute, solo and lock states that includes whether the item is set directly, and also whether it has settable children, and is implicitly set by a parent or child.
+ Added a dynamic extension iterator that allows anyone to iterate and filter the currently active dynamic extensions.
+ Moved Mute and Solo logic into the actual mute / solo extensions, rather than it being implemented in the NodeTree
+ Fixed header coloration for collapsed outliner rows that had selected keys within them. The logic here was incorrect and looked like an error in porting the code. It is now correct (and more efficient).
- Only folders, objects, tracks and track rows now implement mute/solo. Channels and categories were never supported, and now no longer show as such on the UI.
- Deleted the pre-existing XYZEditorExtension classes since they have all been ported to these new caches (the code is largely the same)
#jira UE-193500
#rb Max.Chen
[CL 27669850 by andrew rodham in ue5-main branch]