Bug 59045 no more support to reuse editors
The old search provided the option Window>Preferences>Workbench>Search>"Reuse Editors to Show Matches". This option is no longer honored by the new search implementation. This is a loss of function and we have to revive this option.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/JavaSearchResultPage.java
private static final String KEY_GROUPING= "org.eclipse.jdt.search.resultpage.grouping"; 
	private static final String KEY_SORTING= "org.eclipse.jdt.search.resultpage.sorting"; 
	private static final String KEY_FILTERS= "org.eclipse.jdt.search.resultpage.filters"; 
	
	private static final String GROUP_GROUPING= "org.eclipse.jdt.search.resultpage.grouping"; 
	
	private NewSearchViewActionGroup fActionGroup;
	private JavaSearchContentProvider fContentProvider;
	private int fCurrentSortOrder;
	private SortAction fSortByNameAction;
	private SortAction fSortByParentName;
	private SortAction fSortByPathAction;
	
	private GroupAction fGroupTypeAction;
	private GroupAction fGroupFileAction;
	private GroupAction fGroupPackageAction;
	private GroupAction fGroupProjectAction;
	private int fCurrentGrouping;
	
	private Set fMatchFilters= new HashSet();
	private FilterAction[] fFilterActions;
	public JavaSearchResultPage() {
		initSortActions();
		initGroupingActions();
		initFilterActions();
	}
	
	private void initFilterActions() {
		MatchFilter[] allFilters= MatchFilter.allFilters();