Bug 68011 [java search] "Search the JRE System Libraries" looks like a local preference but behaves as a global one... [search]
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/JavaSearchPage.java
/**
	 * 
	 */
	public JavaSearchPage() {
		fPreviousSearchPatterns= new ArrayList();
	}
	
	
	
	
	public boolean performAction() {
		return performNewSearch();
	}
	
	private boolean performNewSearch() {
		SearchPatternData data= getPatternData();
		
		IJavaSearchScope scope= null;
		String scopeDescription= ""; 
		
		boolean includeJRE= getSearchJRE();
		JavaSearchScopeFactory factory= JavaSearchScopeFactory.getInstance();
		
		switch (getContainer().getSelectedScope()) {
			case ISearchPageContainer.WORKSPACE_SCOPE:
				scopeDescription= SearchMessages.WorkspaceScope; 
				scope= factory.createWorkspaceScope(includeJRE);
				break;
			case ISearchPageContainer.SELECTION_SCOPE:
				scopeDescription= SearchMessages.SelectionScope;