RemoveAllItems() Method (UndoManagersDispatcher<T>)
Removes all items, which are monitored by this dispatcher, and disposes all undo managers of the items.
Target Platforms: .NET 10; .NET 9; .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5