IDEA-176397 Warn about pointless rewrapping of Optional value

Also fixed CommonDataflow: facts must be united, not intersected

java/java-tests/testData/inspection/optionalChains/afterRewrapGet.java

@@ -0,0 +1,10 @@
+// "Unwrap" "true"
+import java.util.*;
+
+public class Tests {
+  void test2(Optional<String> optional) {
+    if (optional.isPresent()) {
+      System.out.println(optional);
+    }
+  }
+}

java/java-tests/testData/inspection/optionalChains/afterRewrapGetSecond.java

@@ -0,0 +1,9 @@
+// "Unwrap" "true"
+import java.util.*;
+
+public class Tests {
+  void test3(Optional<String> optional) {
+    System.out.println(Optional.of(optional.get()));
+    System.out.println(optional);
+  }
+}

java/java-tests/testData/inspection/optionalChains/beforeRewrapGet.java

@@ -0,0 +1,10 @@
+// "Unwrap" "true"
+import java.util.*;
+
+public class Tests {
+  void test2(Optional<String> optional) {
+    if (optional.isPresent()) {
+      System.out.println(Optional.o<caret>f(optional.get()));
+    }
+  }
+}

java/java-tests/testData/inspection/optionalChains/beforeRewrapGetFirst.java

@@ -0,0 +1,9 @@
+// "Unwrap" "false"
+import java.util.*;
+
+public class Tests {
+  void test3(Optional<String> optional) {
+    System.out.println(Optional.o<caret>f(optional.get()));
+    System.out.println(Optional.of(optional.get()));
+  }
+}

java/java-tests/testData/inspection/optionalChains/beforeRewrapGetSecond.java

@@ -0,0 +1,9 @@
+// "Unwrap" "true"
+import java.util.*;
+
+public class Tests {
+  void test3(Optional<String> optional) {
+    System.out.println(Optional.of(optional.get()));
+    System.out.println(Optional.o<caret>f(optional.get()));
+  }
+}

java/java-tests/testData/inspection/optionalChains/beforeRewrapGetUnsure.java

@@ -0,0 +1,10 @@
+// "Unwrap" "false"
+import java.util.*;
+
+public class Tests {
+  void test(Optional<String> optional, boolean b) {
+    if (b || optional.isPresent()) {
+      System.out.println(Optional.o<caret>f(optional.get()));
+    }
+  }
+}