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
for (int i= 0; i < allFilters.length; i++) {
			if (allFilters[i].getID().equals(id))
				return allFilters[i];
		}
		return null;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.search.ui.text.AbstractTextSearchViewPage#saveState(org.eclipse.ui.IMemento)
	 */
	public void saveState(IMemento memento) {
		super.saveState(memento);
		memento.putInteger(KEY_GROUPING, fCurrentGrouping);
		memento.putInteger(KEY_SORTING, fCurrentSortOrder);
		memento.putString(KEY_FILTERS, encodeFilters());
	}
	
	void addMatchFilter(MatchFilter filter) {
		fMatchFilters.add(filter);
		filtersChanged();
	}
	
	void removeMatchFilter(MatchFilter filter) {
		fMatchFilters.remove(filter);
		filtersChanged();
	}
	
	private void filtersChanged() {
		StructuredViewer viewer= getViewer();
		JavaSearchContentProvider cp= (JavaSearchContentProvider) viewer.getContentProvider();
		cp.filtersChanged(getMatchFilters());