Make selecting undoable
A random mouse click can replace a complex selection that might be difficult to reproduce. Making selecting undoable would allow users to recover from this type of mistake. To accomplish this, you need to modify TSelectionTarget to use a command to set the current selection. Make dropping undoable
You can make drop acceptance undoable by modifying MAutoDropAcceptor::AcceptDrop to use a command to insert the dropped data into a model instead of inserting it directly through the selection target. Make TDOMDocument-ComponentView a behavior
Much of the functionality of TDOMDocumentComponentView can be incorporated into an input system behavior. This enables the functionality to be grafted onto views without modifying them and allows this functionality to be added and removed from a view at runtime.
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