add nested stream filter recognition

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/filter/afterFilterNestedStream.java

@@ -0,0 +1,15 @@
+// "Replace with findFirst()" "true"
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class Main {
+  class MappedField{
+    List<MappedField> getLoadNames(){return null;}
+  }
+
+  public MappedField getMappedField(final String storedName) {
+    List<MappedField> persistenceFields = new ArrayList<>();
+      return persistenceFields.stream().filter(mf -> mf.getLoadNames().stream().anyMatch(storedName::equals)).findFirst().orElse(null);
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/filter/beforeFilterNestedStream.java

@@ -0,0 +1,22 @@
+// "Replace with findFirst()" "true"
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class Main {
+  class MappedField{
+    List<MappedField> getLoadNames(){return null;}
+  }
+
+  public MappedField getMappedField(final String storedName) {
+    List<MappedField> persistenceFields = new ArrayList<>();
+    for<caret> (final MappedField mf : persistenceFields) {
+      for (final String n : mf.getLoadNames()) {
+        if (storedName.equals(n)) {
+          return mf;
+        }
+      }
+    }
+    return null;
+  }
+}