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
}
	/**
	 * Set the treeViewer.
	 * @param treeViewer
	 * 
	 * @since 3.1
	 */
	protected void setTreeViewer(TreeViewer treeViewer) {
		this.treeViewer = treeViewer;
	}
	/**
	 * Get the composite that is showing the page.
	 *
	 * @return Composite.
	 * 
	 * @since 3.1
	 */
	protected Composite getPageContainer() {
		return this.pageContainer;
	}
	/**
	 * Set the composite that is showing the page.
	 * @param pageContainer Composite
	 * 
	 * @since 3.1
	 */
	protected void setPageContainer(Composite pageContainer) {
		this.pageContainer = pageContainer;
	}
	/**