Bug 75711 AstProvider should not create AST if requested by SelectionListenerWithASTManager
3.1 M2 If SelectionListenerWithASTManager waits for an AST and the editor closes we should not create an AST for that one but return null instead.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/ClipboardOperationAction.java
public static class ClipboardData {
		
		private String fOriginHandle;
		private String[] fImports;
						
		public ClipboardData(IJavaElement origin, String[] imports) {
			fImports= imports;
			fOriginHandle= origin.getHandleIdentifier();
		}
		
		public ClipboardData(byte[] bytes) throws IOException {
			DataInputStream dataIn = new DataInputStream(new ByteArrayInputStream(bytes));
			
			fOriginHandle= dataIn.readUTF();
			int count= dataIn.readInt();
			
			fImports= new String[count];
			for (int i = 0; i < count; i++) {
				fImports[i]= dataIn.readUTF();
			}