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
MenuManager sortMenu= new MenuManager(SearchMessages.getString("JavaSearchResultPage.sortBylabel")); 
		sortMenu.add(fSortByNameAction);
		sortMenu.add(fSortByPathAction);
		sortMenu.add(fSortByParentName);
		
		fSortByNameAction.setChecked(fCurrentSortOrder == fSortByNameAction.getSortOrder());
		fSortByPathAction.setChecked(fCurrentSortOrder == fSortByPathAction.getSortOrder());
		fSortByParentName.setChecked(fCurrentSortOrder == fSortByParentName.getSortOrder());
		
		mgr.appendToGroup(IContextMenuConstants.GROUP_VIEWER_SETUP, sortMenu);
	}
	
	protected void fillToolbar(IToolBarManager tbm) {
		super.fillToolbar(tbm);
		if (getLayout() != FLAG_LAYOUT_FLAT)
			addGroupActions(tbm);
	}
		
	private void addGroupActions(IToolBarManager mgr) {
		mgr.appendToGroup(IContextMenuConstants.GROUP_VIEWER_SETUP, new Separator(GROUP_GROUPING));
		mgr.appendToGroup(GROUP_GROUPING, fGroupProjectAction);
		mgr.appendToGroup(GROUP_GROUPING, fGroupPackageAction);
		mgr.appendToGroup(GROUP_GROUPING, fGroupFileAction);
		mgr.appendToGroup(GROUP_GROUPING, fGroupTypeAction);
		
		updateGroupingActions();
	}
	private void updateGroupingActions() {
		fGroupProjectAction.setChecked(fCurrentGrouping == LevelTreeContentProvider.LEVEL_PROJECT);
		fGroupPackageAction.setChecked(fCurrentGrouping == LevelTreeContentProvider.LEVEL_PACKAGE);