Bug 81292 [Preferences] Message area should be disabled when empty
200412152000 My GTK theme has a textured background by default. There is a section of the preference dialog next to the Default/Apply buttons that does not respect this. I suspect there is an empty label/text widget that has had its background colour set manually. Screencap forthcoming
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferencePage.java
if (oldValue != isValid) {
            
            if (getContainer() != null)
                getContainer().updateButtons();
            
            updateApplyButton();
        }
    }
    /**
     * Returns a string suitable for debugging purpose only.
     */
    public String toString() {
        return getTitle();
    }
    /**
     * Updates the enabled state of the Apply button to reflect whether 
     * this page is valid.
     */
    protected void updateApplyButton() {
        if (applyButton != null)
            applyButton.setEnabled(isValid());
    }
    /**
     * Creates a composite with a highlighted Note entry and a message text.
     * This is designed to take up the full width of the page.
     * 
     * @param font the font to use
     * @param composite the parent composite
     * @param title the title of the note
     * @param message the message for the note