java completion: suggest expected method type arguments (IDEA-166668)

java/java-tests/testData/codeInsight/completion/normalSorting/PreferExpectedMethodTypeArg.java

@@ -0,0 +1,11 @@
+import java.util.*;
+
+public class Usage {
+  private void demo() {
+    callme(Collections.<<caret>>emptyList());
+  }
+
+  private void callme(List<String> items) {
+  }
+
+}

java/java-tests/testSrc/com/intellij/codeInsight/completion/NormalCompletionOrderingTest.groovy

@@ -705,6 +705,10 @@ class ContainerUtil extends ContainerUtilRt {
     assert LookupElementPresentation.renderElement(myFixture.lookupElements[1]).tailText.contains('pack2')
   }
 
+  void testPreferExpectedMethodTypeArg() {
+    checkPreferredItems 0, 'String'
+  }
+
   void testMethodStatisticsPerQualifierType() {
     checkPreferredItems 0, 'charAt'
     myFixture.type('eq\n);\n')