GuavaFluentIterableInspection: visitor moved to checkFile() + fixed findContainingMethodReturnType() method when expression is placed inside lambda expression

java/java-tests/testData/inspection/guava/insideLambda.java

@@ -0,0 +1,19 @@
+import com.google.common.base.*;
+import com.google.common.base.Function;
+import com.google.common.collect.FluentIterable;
+import java.util.ArrayList;
+
+public class Main20 {
+  void m() {
+    Supplier<Object> doubleSupplier = () -> {
+      FluentIterable<String> fi = FluentIterable.from(new ArrayList<String>());
+      return fi.transf<caret>orm(new Function<String, Integer>() {
+        @Override
+        public Integer apply(String input) {
+          return input.length();
+        }
+      });
+    };
+
+  }
+}

java/java-tests/testData/inspection/guava/insideLambda_after.java

@@ -0,0 +1,15 @@
+import com.google.common.base.*;
+import com.google.common.base.Function;
+import com.google.common.collect.FluentIterable;
+import java.util.ArrayList;
+import java.util.stream.Stream;
+
+public class Main20 {
+  void m() {
+    Supplier<Object> doubleSupplier = () -> {
+      Stream<String> fi = new ArrayList<String>().stream();
+      return fi.map(input -> input.length());
+    };
+
+  }
+}