type migration: fix AIOOBE for method with generic varargs migration (EA-87127)

java/typeMigration/test/com/intellij/refactoring/TypeMigrationTest.java

@@ -862,6 +862,10 @@ public class TypeMigrationTest extends TypeMigrationTestBase {
     doTestMethodType("migrationMethod", PsiType.VOID);
   }
 
+  public void testGenericEllipsis() {
+    doTestFieldType("migrationField", myJavaFacade.getElementFactory().createTypeFromText("Test<Short>", null));
+  }
+
   private void doTestReturnType(final String methodName, final String migrationType) {
     start(new RulesProvider() {
       @Override

java/typeMigration/testData/refactoring/typeMigration/genericEllipsis/after/Test.items

@@ -0,0 +1,10 @@
+Types:
+PsiField:migrationField : Test<java.lang.Short>
+PsiMethodCallExpression:migrationField.method() : void
+PsiReferenceExpression:migrationField : Test<java.lang.Short>
+
+Conversions:
+migrationField.method() -> $
+
+New expression type changes:
+Fails:

java/typeMigration/testData/refactoring/typeMigration/genericEllipsis/after/test.java

@@ -0,0 +1,11 @@
+class Test<X> {
+    private static Test<Short> migrationField;
+
+    private static void m() {
+        migrationField.method();
+    }
+
+    void method(X... xes) {
+
+    }
+}

java/typeMigration/testData/refactoring/typeMigration/genericEllipsis/before/test.java

@@ -0,0 +1,11 @@
+class Test<X> {
+    private static Test<Integer> migrationField;
+
+    private static void m() {
+        migrationField.method();
+    }
+
+    void method(X... xes) {
+
+    }
+}