- terrain_profile_processor.cpp: Add ImmutablePart.h and ImmutablePartCollection.h includes for Qt6 ArcGIS SDK v300 - base_symbol_model.cpp: Replace 4x invalidateFilter() with beginFilterChange()/endFilterChange() for Qt6 QSortFilterProxyModel compatibility Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>