Add cross-directory filesystem move support

- enable efsw cross-directory move reporting in ecode
  - transfer FileSystemModel nodes between materialized parents
  - preserve selections, descendant paths, and lazy destination branches
  - update open document paths when parent directories move
  - fix persistent indexes across insert, delete, and move operations
  - clear stale tree-view metadata before model nodes are deleted
  - safely handle getRealPath() failures for stale paths
  - add model operation and filesystem move regression tests
  - update efsw and SOIL2 submodules

include/eepp/system/fileinfo.hpp

@@ -74,6 +74,10 @@ class EE_API FileInfo {
 
 	const Uint64& getInode() const;
 
+	const Uint64& getDevice() const;
+
+	const Uint64& getLinkCount() const;
+
 	bool isUninitialized() const;
 
 	std::string getExtension( const bool& lowerExt = true ) const;
@@ -87,6 +91,8 @@ class EE_API FileInfo {
 	Uint32 mGroupId{ 0 };
 	Uint32 mPermissions{ 0 };
 	Uint64 mInode{ 0 };
+	Uint64 mDevice{ 0 };
+	Uint64 mLinkCount{ 0 };
 };
 
 typedef std::map<std::string, FileInfo> FileInfoMap;

include/eepp/ui/abstract/uiabstractview.hpp

@@ -137,6 +137,8 @@ class EE_API UIAbstractView : public UIScrollableWidget {
 
 	virtual void onModelSelectionChange();
 
+	virtual void onModelIndexDeleted( const void* ) {}
+
 	void modelUpdate( unsigned flags );
 
 	UIAbstractView( const std::string& tag );

include/eepp/ui/models/filesystemmodel.hpp

@@ -228,7 +228,7 @@ class EE_API FileSystemModel : public Model {
 					 const DisplayConfig& displayConfig, Translator* translator,
 					 std::shared_ptr<ThreadPool> threadPool );
 
-	size_t getFileIndex( Node* parent, const FileInfo& file );
+	size_t getFileIndex( Node* parent, const FileInfo& file, const Node* excludedNode = nullptr );
 
 	bool handleFileEventLocked( const FileEvent& event );
 

include/eepp/ui/models/model.hpp

@@ -174,6 +174,12 @@ class EE_API Model {
 	enum class Direction { Row, Column };
 
 	struct Operation {
+		struct PersistentMove {
+			ModelIndex index;
+			ModelIndex targetParent;
+			int targetDimension;
+		};
+
 		OperationType type{ OperationType::Invalid };
 		Direction direction{ Direction::Row };
 		ModelIndex sourceParent;
@@ -181,6 +187,7 @@ class EE_API Model {
 		int last{ 0 };
 		ModelIndex targetParent;
 		int target{ 0 };
+		std::vector<PersistentMove> persistentMoves;
 
 		Operation( OperationType type ) : type( type ) {}
 
@@ -206,6 +213,10 @@ class EE_API Model {
 	void handleInsert( Operation const& );
 	void handleMove( Operation const& );
 	void handleDelete( Operation const& );
+	void saveMovedIndices( Operation& );
+	void notifyIndexDeleted( const void* internalData ) const;
+	void applyPersistentIndexChanges(
+		const std::vector<std::pair<ModelIndex, ModelIndex>>& indexChanges );
 
 	template <bool IsRow> void saveDeletedIndices( ModelIndex const& parent, int first, int last );
 

include/eepp/ui/models/persistentmodelindex.hpp

@@ -18,7 +18,7 @@ class PersistentHandle {
 	ModelIndex mIndex;
 };
 
-class PersistentModelIndex {
+class EE_API PersistentModelIndex {
   public:
 	PersistentModelIndex() {}
 	PersistentModelIndex( ModelIndex const& );

include/eepp/ui/uitreeview.hpp

@@ -165,6 +165,8 @@ class EE_API UITreeView : public UIAbstractTableView {
 
 	virtual void onColumnSizeChange( const size_t& colIndex, bool fromUserInteraction = false );
 
+	virtual void onModelIndexDeleted( const void* internalData );
+
 	virtual UIWidget* updateCell( const Vector2<Int64>& posIndex, const ModelIndex& index,
 								  const size_t& indentLevel, const Float& yOffset );