[java-refactoring] IDEA-340087 produce accurate PsiType for implicit classes

- fix Introduce variable throws exception in implicit classes

GitOrigin-RevId: c3489b1c6df3669f01b6e5defbf8a2208a7b441d

java/java-tests/testData/refactoring/introduceVariable/FromFinalFieldOnAssignment.after.java

@@ -2,7 +2,7 @@ public class C {
   private final String myStr;
 
   public C() {
-    myStr = "";
       String strings = myStr;
+      strings = "";
   }
 }

java/java-tests/testData/refactoring/introduceVariable/IntroduceVariableInsideImplicitClass.after.java

@@ -0,0 +1,8 @@
+class Nested {
+}
+
+void main() {
+    Class<Nested> x = Nested.class;
+    System.out.println(x);
+}
+

java/java-tests/testData/refactoring/introduceVariable/IntroduceVariableInsideImplicitClass.java

@@ -0,0 +1,7 @@
+class Nested {
+}
+
+void main() {
+  System.out.println(<selection>Nested.class</selection>);
+}
+

java/java-tests/testData/refactoring/introduceVariable/NoNameConflict.after.java

@@ -1,5 +1,5 @@
 class cTest {
   {
-      cTest cTest = new cTest();<caret>
+      cTest <caret>cTest = new cTest();
   }
 }

java/java-tests/testData/refactoring/introduceVariable/SCR26075For.after.java

@@ -7,8 +7,7 @@ class C {
 
     void test () {
         C c = new C();
-        String wrong = c.f();
-        for (; wrong != null;) {
+        for (;c.f() != null;) {
             c = c.getParent();
         }
     }