Polish "Support flash attrs..." and related classes

- Eliminate trailing whitespace

 - Update long method signatures to follow framework whitespace
   conventions

   Based on the following search,

       $ git grep -A3 '^.public .* .*([^\{;]*$' */src/main

   the strong convention throughout the framework when dealing with
   methods having long signatures (i.e. many parameters) is to break
   immediately after the opening paren, indent two tabs deeper and break
   lines around 90 characters as necessary. Such signatures should also
   be followed by a newline after the opening curly brace to break
   things up visually.

   The files edited in this commit had a particularly different style of
   intenting arguments to align with each other vertically, but the
   alignment only worked if one's tabstop is set at four spaces.
   When viewed at a different tabstop value, the effect is is jarring,
   both in that it is misaligned and significantly different from most
   of the framework. The convention described above reads well at any
   tabstop value.

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ModelAndViewMethodReturnValueHandlerTests.java

@@ -37,7 +37,7 @@ import org.springframework.web.servlet.view.RedirectView;
 
 /**
  * Test fixture with {@link ModelAndViewMethodReturnValueHandler}.
- * 
+ *
  * @author Rossen Stoyanchev
  */
 public class ModelAndViewMethodReturnValueHandlerTests {
@@ -57,7 +57,7 @@ public class ModelAndViewMethodReturnValueHandlerTests {
 		this.webRequest = new ServletWebRequest(new MockHttpServletRequest());
 		this.returnParamModelAndView = getReturnValueParam("modelAndView");
 	}
-	
+
 	@Test
 	public void supportsReturnType() throws Exception {
 		assertTrue(handler.supportsReturnType(returnParamModelAndView));
@@ -68,7 +68,7 @@ public class ModelAndViewMethodReturnValueHandlerTests {
 	public void handleViewReference() throws Exception {
 		ModelAndView mav = new ModelAndView("viewName", "attrName", "attrValue");
 		handler.handleReturnValue(mav, returnParamModelAndView, mavContainer, webRequest);
-		
+
 		assertEquals("viewName", mavContainer.getView());
 		assertEquals("attrValue", mavContainer.getModel().get("attrName"));
 	}
@@ -77,7 +77,7 @@ public class ModelAndViewMethodReturnValueHandlerTests {
 	public void handleViewInstance() throws Exception {
 		ModelAndView mav = new ModelAndView(new RedirectView(), "attrName", "attrValue");
 		handler.handleReturnValue(mav, returnParamModelAndView, mavContainer, webRequest);
-		
+
 		assertEquals(RedirectView.class, mavContainer.getView().getClass());
 		assertEquals("attrValue", mavContainer.getModel().get("attrName"));
 	}
@@ -85,7 +85,7 @@ public class ModelAndViewMethodReturnValueHandlerTests {
 	@Test
 	public void handleNull() throws Exception {
 		handler.handleReturnValue(null, returnParamModelAndView, mavContainer, webRequest);
-		
+
 		assertTrue(mavContainer.isRequestHandled());
 	}
 
@@ -93,10 +93,10 @@ public class ModelAndViewMethodReturnValueHandlerTests {
 	public void handleRedirectAttributesWithViewReference() throws Exception {
 		RedirectAttributesModelMap redirectAttributes  = new RedirectAttributesModelMap();
 		mavContainer.setRedirectModel(redirectAttributes);
-		
+
 		ModelAndView mav = new ModelAndView(new RedirectView(), "attrName", "attrValue");
 		handler.handleReturnValue(mav, returnParamModelAndView, mavContainer, webRequest);
-		
+
 		assertEquals(RedirectView.class, mavContainer.getView().getClass());
 		assertEquals("attrValue", mavContainer.getModel().get("attrName"));
 		assertSame("RedirectAttributes should be used if controller redirects", redirectAttributes,
@@ -107,24 +107,24 @@ public class ModelAndViewMethodReturnValueHandlerTests {
 	public void handleRedirectAttributesWithViewInstance() throws Exception {
 		RedirectAttributesModelMap redirectAttributes  = new RedirectAttributesModelMap();
 		mavContainer.setRedirectModel(redirectAttributes);
-		
+
 		ModelAndView mav = new ModelAndView("redirect:viewName", "attrName", "attrValue");
 		handler.handleReturnValue(mav, returnParamModelAndView, mavContainer, webRequest);
-		
+
 		ModelMap model = mavContainer.getModel();
 		assertEquals("redirect:viewName", mavContainer.getViewName());
 		assertEquals("attrValue", model.get("attrName"));
 		assertSame("RedirectAttributes should be used if controller redirects", redirectAttributes, model);
 	}
-	
+
 	@Test
 	public void handleRedirectAttributesWithoutRedirect() throws Exception {
 		RedirectAttributesModelMap redirectAttributes  = new RedirectAttributesModelMap();
 		mavContainer.setRedirectModel(redirectAttributes);
-		
+
 		ModelAndView mav = new ModelAndView();
 		handler.handleReturnValue(mav, returnParamModelAndView, mavContainer, webRequest);
-		
+
 		ModelMap model = mavContainer.getModel();
 		assertEquals(null, mavContainer.getView());
 		assertTrue(mavContainer.getModel().isEmpty());
@@ -136,7 +136,7 @@ public class ModelAndViewMethodReturnValueHandlerTests {
 		Method method = getClass().getDeclaredMethod(methodName);
 		return new MethodParameter(method, -1);
 	}
-	
+
 	ModelAndView modelAndView() {
 		return null;
 	}
@@ -144,5 +144,5 @@ public class ModelAndViewMethodReturnValueHandlerTests {
 	String viewName() {
 		return null;
 	}
-	
-}
+
+}