Bug 171027 Emtpy space created when calling setEnabled on encoding field editor
I20070116-1510 FieldEditor.setEnabled(boolean) is implemented in a pretty strange way: it creates the label if not yet created. This has side effects for clients that do not need/create that label but later call setEnabled(...). An example for such a subclass is AbstractEncodingFieldEditor. Now, fixing this in FieldEditor.setEnabled(...) might be problematic because currently for some clients the label might only appear as a side-effect of calling setEnabled(...) during initialization. A safer fix might be to simply not call super.setEnabled(...) in AbstractEncodingFieldEditor.setEnabled(...).
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/dialogs/AbstractEncodingFieldEditor.java
private void updateDefaultEncoding() {
		defaultEncodingButton.setText(defaultButtonText());
	}
	private Composite getContainer() {
		return container;
	}
	/**
	 * Creates a composite with all the encoding controls.
	 * <p>
	 * Subclasses may extend.
	 * </p>
	 * 
	 * @param parent
	 *            the parent widget
	 * @param numColumns
	 *            the number of columns in the parent
	 * @return the group control
	 */
	protected Composite createEncodingGroup(Composite parent, int numColumns) {
		Composite topControl;
		GridLayout layout = new GridLayout();
		layout.numColumns = 2;
		if (groupTitle == null){
			topControl = new Composite(parent, SWT.NONE);
			layout.marginWidth = 0;
			layout.marginHeight = 0;
		}
		else {
			Group top = new Group(parent, SWT.NONE);
			top.setText(groupTitle);