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/PreferenceDialog.java
/**
	 * Save the currently selected node. 
	 */
	private void setSelectedNode() {
		String storeValue = null;
		if (tree.getSelectionCount() == 1) {
			TreeItem currentSelection = tree.getSelection()[0];
			Object data = currentSelection.getData();
			if (currentSelection.getData() instanceof IPreferenceNode)
				storeValue = ((IPreferenceNode) data).getId();
		}
		setSelectedNodePreference(storeValue);
	}
	/**
	 * Display the given error message. The currently displayed message
	 * is saved and will be redisplayed when the error message is set
	 * to <code>null</code>.
	 *
	 * @param errorMessage the errorMessage to display or <code>null</code>
	 */
	public void setErrorMessage(String newErrorMessage) {
		
		if (errorMessage == null
			? newErrorMessage == null
			: errorMessage.equals(newErrorMessage))
			return;
		errorMessage = newErrorMessage;
		if (errorMessage == null) {
			if (showingError) {