Bug 84983 [typing] imports disappear
I20050209-0800 + JDT UI from HEAD 1. open a CU with several imports 2. enable folding (ensure imports are folded) 3. remove code so that first import is no longer needed 4. run Organize Imports ==> all imports are gone 5. close and re-open the editor ==> imports are back
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/DefaultJavaFoldingStructureProvider.java
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaElementDelta;
import org.eclipse.jdt.core.IMember;
import org.eclipse.jdt.core.IParent;
import org.eclipse.jdt.core.ISourceRange;
import org.eclipse.jdt.core.ISourceReference;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.ToolFactory;
import org.eclipse.jdt.core.compiler.IScanner;
import org.eclipse.jdt.core.compiler.ITerminalSymbols;
import org.eclipse.jdt.core.compiler.InvalidInputException;
import org.eclipse.jdt.ui.IWorkingCopyManager;
import org.eclipse.jdt.ui.PreferenceConstants;
import org.eclipse.jdt.ui.text.folding.IJavaFoldingStructureProvider;
import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.javaeditor.ClassFileEditor;
import org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor;
import org.eclipse.jdt.internal.ui.javaeditor.IClassFileEditorInput;
import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
import org.eclipse.jdt.internal.ui.text.DocumentCharacterIterator;
/**
 * Updates the projection model of a class file or compilation unit.
 *
 * @since 3.0
 */
public class DefaultJavaFoldingStructureProvider implements IProjectionListener, IJavaFoldingStructureProvider {
	
	private static final class JavaProjectionAnnotation extends ProjectionAnnotation {