Bug 123965 [Preferences] Cancelling Compiler Error/Warning property page still puts them in effect
Eclipse 3.2 M4 When changing the "Non-externalized strings" field (under properties -> java compiler -> Errors/Warnings) from Ignore to Error a message appears stating that a project rebuild is required for the changes to take effect. Unfortunately, the rebuild still occurs even if the user clicks Cancel. Also, once the cancel button returns the user to the settings window the OK button is no longer available and the user must click the cancel button. Futhermore, even after the cancel button is clicked, the setting changes are still put into effect.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
/**
	 * 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 newErrorMessage
	 *            the errorMessage to display or <code>null</code>
	 */
	public void setErrorMessage(String newErrorMessage) {
		if (newErrorMessage == null)
			messageArea.clearErrorMessage();
		else
			messageArea.updateText(newErrorMessage, IMessageProvider.ERROR);
	}
	/**
	 * Save the last known tree width.
	 * 
	 * @param width
	 *            the width.
	 */
	private void setLastTreeWidth(int width) {
		lastTreeWidth = width;
	}
	/**
	 * Set the message text. If the message line currently displays an error,
	 * the message is stored and will be shown after a call to clearErrorMessage
	 * <p>
	 * Shortcut for <code>setMessage(newMessage, NONE)</code>
	 * </p>
	 *