Java: Detect trivial duplicates containing 'break' and 'continue' (IDEA-182195)

java/java-tests/testData/refactoring/extractMethod/NullableCheckBreakDuplicate_after.java

@@ -0,0 +1,38 @@
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+public class NullableCheckBreakDuplicate {
+    List<Pojo> things;
+
+    void foo() {
+        while (true) {
+
+            Pojo x = newMethod();
+            if (x == null) break;
+            System.out.println(x.it);
+        }
+    }
+
+    @Nullable
+    private Pojo newMethod() {
+        Pojo x = things.get(0);
+
+        if (x.it > 0) return null;
+        things.remove(x);
+        return x;
+    }
+
+    void baz() {
+        while (true) {
+            Pojo x = newMethod();
+            if (x == null) break;
+            System.out.println(x.it);
+        }
+    }
+
+    static class Pojo {
+        double it;
+        Pojo(double w) { it = w; }
+    }
+}