Bug 229807 [JFace] ConfigureColumnsDialog does not work correctly with reordered columns
The logic for dealing with column order is backwards. Should be columnObjects[i] = cObjects[columnOrder[i]]; instead of columnObjects[columnOrder[i]] = cObjects[i];
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/PropertySheetPage.java
if (defaultsAction != null) {
            if (selection.isEmpty()) {
                defaultsAction.setEnabled(false);
                return;
            }
            
            boolean editable = viewer.getActiveCellEditor() != null;
            defaultsAction.setEnabled(editable);
        }
    }
    /**
     * Adds drag and drop support.
     */
    protected void initDragAndDrop() {
        int operations = DND.DROP_COPY;
        Transfer[] transferTypes = new Transfer[] { TextTransfer.getInstance() };
        DragSourceListener listener = new DragSourceAdapter() {
            public void dragSetData(DragSourceEvent event) {
                performDragSetData(event);
            }
            public void dragFinished(DragSourceEvent event) {
                
            }
        };
        DragSource dragSource = new DragSource(
                viewer.getControl(), operations);
        dragSource.setTransfer(transferTypes);
        dragSource.addDragListener(listener);
    }
    /**