Bug 71287 Reuse editor preference has no effect in tree mode
options -> Reuse editors to show matches in workbench -> search - has no effect
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/JavaSearchResultPage.java
private static final String GROUP_GROUPING= "org.eclipse.jdt.search.resultpage.grouping"; 
	private static final String GROUP_FILTERING = "org.eclipse.jdt.search.resultpage.filtering"; 
	
	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;
	private FiltersDialogAction fFilterDialogAction;
	
	private static final String[] SHOW_IN_TARGETS= new String[] { JavaUI.ID_PACKAGES , IPageLayout.ID_RES_NAV };
	public static final IShowInTargetList SHOW_IN_TARGET_LIST= new IShowInTargetList() {
		public String[] getShowInTargetIds() {
			return SHOW_IN_TARGETS;
		}
	};
	
	private JavaSearchEditorOpener fEditorOpener= new JavaSearchEditorOpener();
	private boolean fLimitElements= false;
	private int fElementLimit;