enable diamonds in field initializers (IDEA-63979)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting7/DiamondMisc.java

@@ -0,0 +1,6 @@
+import java.util.ArrayList;
+import java.util.List;
+
+class Test {
+  List<String> queue = new ArrayList<>();
+}

java/java-tests/testSrc/com/intellij/codeInsight/daemon/LightAdvHighlightingJdk7Test.java

@@ -77,6 +77,10 @@ public class LightAdvHighlightingJdk7Test extends LightDaemonAnalyzerTestCase {
     doTest(false, false);
   }
 
+  public void testDiamondMisc() throws Exception {
+    doTest(false, false);
+  }
+
   public void testDynamicallyAddIgnoredAnnotations() throws Exception {
     ExtensionPoint<EntryPoint> point = Extensions.getRootArea().getExtensionPoint(ExtensionPoints.DEAD_CODE_TOOL);
     EntryPoint extension = new EntryPoint() {

java/openapi/src/com/intellij/psi/PsiDiamondType.java

@@ -123,6 +123,8 @@ public class PsiDiamondType extends PsiType {
             }
           }
         }
+      } else if (parent instanceof PsiVariable) {
+        return getComponentTypes(((PsiVariable)parent).getType());
       }
     }
     return NULL_TYPES;