* Return true if favorite is added, false if favorite is removed
*/
public boolean toggleFavouriteIssueFilter(Long filterId, UserSession userSession) {
String user = getLoggedLogin(userSession);
findIssueFilterDto(filterId, user);
IssueFilterFavouriteDto issueFilterFavouriteDto = selectFavouriteFilterForUser(filterId, user);
if (issueFilterFavouriteDto == null) {
addFavouriteIssueFilter(filterId, user);
return true;
} else {
deleteFavouriteIssueFilter(issueFilterFavouriteDto);