Bug 29698 drag and drop of java files between packages in package explorer doesn't work
the <preview> <ok> <cancel> dialog shows up, but <ok> has the same effect as <cancel> and <preview> would only show movements of files and no changes in imports of other java files. on <ok> in the preview it only moves the file(s) (as indicated ) without changing referencing imports.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/reorg/JdtMoveAction.java
fReferenceCheckbox= new Button(result, SWT.CHECK);
			fReferenceCheckbox.setText(ReorgMessages.getString("JdtMoveAction.update_references")); 
			fReferenceCheckbox.setSelection(true);
			fReferenceCheckbox.setEnabled(canUpdateReferences());
			
			fReferenceCheckbox.addSelectionListener(new SelectionAdapter() {
				public void widgetSelected(SelectionEvent e) {
					fRefactoring.setUpdateReferences(((Button)e.widget).getSelection());
					updateOKStatus();
				}
			});
		}
		
		private boolean canUpdateReferences() {
			try{
				return fRefactoring.canUpdateReferences();
			} catch (JavaModelException e){
				return false;
			}
		}
		
		private void addUpdateQualifiedNameComponent(Composite parent, int marginWidth) {
			if (!fRefactoring.canUpdateQualifiedNames())
				return;
			fQualifiedNameCheckbox= new Button(parent, SWT.CHECK);
			int indent= marginWidth + fQualifiedNameCheckbox.computeSize(SWT.DEFAULT, SWT.DEFAULT).x;
			fQualifiedNameCheckbox.setText(RefactoringMessages.getString("RenameInputWizardPage.update_qualified_names")); 
			fQualifiedNameCheckbox.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
			fQualifiedNameCheckbox.setSelection(fRefactoring.getUpdateQualifiedNames());