Bug 137073 [Preferences] Encoding field editor never fires value change events
The class AbstractEncodingFieldEditor never fires VALUE property change events unless the validaty of the value has also changed. I will attach a patch that corrects the problem.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/dialogs/AbstractEncodingFieldEditor.java
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Group;
import org.eclipse.ui.WorkbenchEncoding;
import org.eclipse.ui.ide.IDEEncoding;
import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
/**
 * The abstract superclass of field editors used to set an encoding. Any user
 * entered encodings will be added to the list of encodings available via
 * {@link org.eclipse.ui.ide.IDEEncoding}.
 * <p>
 * Subclasses may extend, but must call <code>createEncodingGroup</code>
 * during <code>doFillIntoGrid</code>.
 * </p>
 * 
 * @see org.eclipse.ui.ide.IDEEncoding
 * @since 3.1
 */
public abstract class AbstractEncodingFieldEditor extends FieldEditor {
	private Composite container;
	private Button defaultEncodingButton;
	private String defaultEnc;
	private Button otherEncodingButton;
	private Combo encodingCombo;
	private boolean isValid = true;
	private String oldSelectedEncoding;
	private String groupTitle = IDEWorkbenchMessages.WorkbenchPreference_encoding;
	/**
	 * Creates a new encoding field editor with no settings set.