Bug 296691 Change new Groups API to Virtual Resource API
If we decide that 'virtual' is the right naming for new resources concept, I will make the following changes. Add IResource#VIRTUAL flag to use in #create methods Add IResource#isVirtual indicating that a resource is virtual Remove IResource#isGroup Remove IFolder#createGroup
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/navigator/NavigatorDropAdapter.java
IOverwriteQuery {
    /**
     * A flag indicating that overwrites should always occur.
     */
    private boolean alwaysOverwrite = false;
    /**
     * The last valid operation.
     */
    private int lastValidOperation = DND.DROP_NONE;
    /**
     * Constructs a new drop adapter.
     *