Seems like now response.createRenderURL(linkToNode) doesn't work properly anymore on on resolved poerlets from other pages.
PortalNode thisNode = request.getPortalNode().getParent();
PortalNode linkToNode = thisNode.resolve("../../default/Reservation/ReservationPortletWindow");
PortalNodeURL pageURL = response.createRenderURL(linkToNode);
request.setAttribute("urlOnReservationForm", pageURL.toString());
results in
/portal/default/Reservation/ReservationPortletWindow
instead of previous portal 2.6 behaviour
/portal/default/Reservation/ReservationPortletWindow?action=2
As you can see necessary parameters are missing.
