Bug 30170 [Preferences] editors preferences not stored on OK?
20030121 my eclipse hard-crashed and it seems that the 'number of open editors' preference was lost preference pages should store their values on OK. i guess the 'Editors' page forgot to do it.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceStore.java
*/
public void setToDefault(String name) {
	Object oldValue = properties.get(name);
	properties.remove(name);
	dirty = true;
	Object newValue = null;
	if (defaultProperties != null)
		newValue = defaultProperties.get(name);
	firePropertyChangeEvent(name, oldValue, newValue);
}
/* (non-Javadoc)
 * Method declared on IPreferenceStore.
 */
public void setValue(String name, double value) {
	double oldValue = getDouble(name);
	if (oldValue != value) {
		setValue(properties, name, value);
		dirty = true;
		firePropertyChangeEvent(name, new Double(oldValue), new Double(value));
	}
}
/* (non-Javadoc)
 * Method declared on IPreferenceStore.
 */
public void setValue(String name, float value) {
	float oldValue = getFloat(name);
	if (oldValue != value) {
		setValue(properties, name, value);
		dirty = true;
		firePropertyChangeEvent(name, new Float(oldValue), new Float(value));