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
if(currentPage == null)
			return;
		messageArea.showTitle(currentPage.getTitle(), currentPage.getImage());
	}
	/**
	 * Update the tree to use the specified <code>Font</code>.
	 * 
	 * @param dialogFont
	 *            the <code>Font</code> to use.
	 * @since 3.0
	 */
	protected void updateTreeFont(Font dialogFont) {
		getTreeViewer().getControl().setFont(dialogFont);
	}
	/**
	 * Returns the currentPage.
	 * @return IPreferencePage
	 * @since 3.1
	 */
	protected IPreferencePage getCurrentPage() {
		return currentPage;
	}
	/**
	 * Sets the current page.
	 * @param currentPage
	 * 
	 * @since 3.1
	 */
	protected void setCurrentPage(IPreferencePage currentPage) {
		this.currentPage = currentPage;