Add MoveItem method to easily move a item within a list. Fix line limit.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42475 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/support/ObjectList.h

@@ -101,6 +101,7 @@ public:
 
 	bool Owning() const;
 	bool ReplaceItem(int32, void *);
+	bool MoveItem(int32 from, int32 to);
 
 protected:
 	bool owning;
@@ -154,6 +155,7 @@ public:
 									// same as ReplaceItem, except does not
 									// delete old item at <index>, returns it
 									// instead
+			bool				MoveItem(int32 from, int32 to);
 
 			T*					FirstItem() const;
 			T*					LastItem() const;
@@ -552,6 +554,14 @@ BObjectList<T>::SwapWithItem(int32 index, T* newItem)
 }
 
 
+template<class T>
+bool
+BObjectList<T>::MoveItem(int32 from, int32 to)
+{
+	return _PointerList_::MoveItem(from, to);
+}
+
+
 template<class T>
 void
 BObjectList<T>::_SetItem(int32 index, T* newItem)