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
versep.setLayoutData(verGd);
		versep.setLayoutData(new GridData(SWT.LEFT, SWT.FILL, false, true));
		
		Composite pageAreaComposite = new Composite(composite, SWT.NONE);
		pageAreaComposite.setLayoutData(new GridData(GridData.FILL_BOTH));
		GridLayout layout = new GridLayout(1, true);
		layout.marginHeight = 0;
		layout.marginWidth = IDialogConstants.HORIZONTAL_MARGIN;
		pageAreaComposite.setLayout(layout);
		
	
		
		
		Composite titleComposite = new Composite(pageAreaComposite, SWT.NONE);
		layout = new GridLayout();
		layout.marginHeight = 0;
		layout.marginWidth = 0;
		layout.verticalSpacing = 0;
		layout.horizontalSpacing = 0;
		titleComposite.setLayout(layout);
		titleComposite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		createTitleArea(titleComposite);
		
		Label separator = new Label(pageAreaComposite, SWT.HORIZONTAL | SWT.SEPARATOR);
		separator.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL));
		
		
		
		pageContainer = createPageContainer(pageAreaComposite);