Bug 94674 [Preferences] Preferences dialog separator under Title for pages does not stretch all the way across
The separator under the Header title for a preference page should stretch from the border of the sash to the far right with no margins in between.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
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 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
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 * http://www.eclipse.org/legal/epl-v10.html
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 * Contributors:
 *     IBM Corporation - initial API and implementation
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package org.eclipse.jface.preference;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;