TerminalOperation: check arguments count for "collectingAndThen" collector.

Fixes EA-127467 - AIOOBE: TerminalOperation.fromCollector

java/java-impl/src/com/intellij/codeInspection/streamToLoop/TerminalOperation.java

@@ -193,6 +193,7 @@ abstract class TerminalOperation extends Operation {
         fn = FunctionHelper.create(collectorArgs[0], 0);
         return fn == null ? null : new ToCollectionTerminalOperation(resultType, fn, null);
       case "collectingAndThen": {
+        if (collectorArgs.length != 2) return null;
         PsiExpression collectorCall = collectorArgs[0];
         PsiType downstreamResultType = PsiUtil.substituteTypeParameter(collectorCall.getType(), "java.util.stream.Collector", 2, false);
         if (downstreamResultType == null) return null;

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamToLoop/afterCollectingAndThen.java

@@ -56,4 +56,10 @@ public class Main {
       }
       Map<Integer, List<String>> map = Collections.unmodifiableMap(result);
   }
+
+  void incomplete(List<String> people) {
+    List<String> list1 = people.stream().collect( // comment
+                                                         Collectors.collectingAndThen(Collectors.toList()));
+  }
+
 }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamToLoop/beforeCollectingAndThen.java

@@ -36,4 +36,10 @@ public class Main {
       Collectors.collectingAndThen(Collectors.groupingBy(String::length),
                                    m -> Collections.unmodifiableMap(m)));
   }
+
+  void incomplete(List<String> people) {
+    List<String> list1 = people.stream().collect( // comment
+                                                         Collectors.collectingAndThen(Collectors.toList()));
+  }
+
 }