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Magne Sjaastad
92da6633bb
Introduce a shared base for tree-shaped folder containers that hold a list of leaf items together with a list of subcontainers of the same kind. Replaces the per-class plumbing (subcollections field, top-folder flag, add/remove/find sub-collection, factory) that is duplicated across RimSurfaceCollection, RimPolygonCollection and similar candidates. - caf::PdmNestedCollectionBase: non-templated PdmObject base exposing collection-name, add-new-subcollection, leaf-check and topmost-folder marking for generic command features and script methods. - caf::PdmNestedCollection<SelfT, ItemT>: CRTP template that owns the typed m_subCollections field and inherits the m_items array from PdmObjectCollection<ItemT>. Provides allItems(), find-sub-collection, and a typed factory hook. - RimNestedMirrorCollectionInView: view-side analogue for in-view collections that mirror a nested source collection, with orphan-sweep + find-or-create + reorder sync. Design rationale (templated vs non-templated, break-even on derived class count) lives in docs/pdm-nested-collection-design.md. No callers migrated in this commit.