resolve import conflict with implicit imports (IDEA-100555)

java/java-impl/src/com/intellij/psi/impl/source/codeStyle/ImportHelper.java

@@ -449,7 +449,7 @@ public class ImportHelper{
       }
       // check conflicts
       if (useOnDemand){
-        PsiElement[] onDemandRefs = file.getOnDemandImports(false, true);
+        PsiElement[] onDemandRefs = file.getOnDemandImports(true, true);
         List<String> refTexts = new ArrayList<>(onDemandRefs.length);
         for (PsiElement ref : onDemandRefs) {
           String refName = ref instanceof PsiClass ? ((PsiClass)ref).getQualifiedName() : ((PsiPackage)ref).getQualifiedName();

java/java-tests/testSrc/com/intellij/java/codeInsight/intention/AddImportActionTest.groovy

@@ -226,6 +226,56 @@ class C {
      B b;
 }
 
+'''
+  }
+  
+  void testImportFoldingWithConflictsToJavaLang() {
+
+    myFixture.addClass 'package p1; public class String {}'
+    myFixture.addClass 'package p1; public class A1 {}'
+    myFixture.addClass 'package p1; public class A2 {}'
+    myFixture.addClass 'package p1; public class A3 {}'
+    myFixture.addClass 'package p1; public class A4 {}'
+    myFixture.addClass 'package p1; public class A5 {}'
+
+    myFixture.configureByText 'C.java', '''package p2;
+
+import p1.A1;
+import p1.A2;
+import p1.A3;
+import p1.A4;
+
+class C {
+
+     A1 a1;
+     A2 a2;
+     A3 a3;
+     A4 a4;
+     A<caret>5 a5;
+
+     String myName;
+}
+
+'''
+    importClass()
+
+    myFixture.checkResult '''package p2;
+
+import p1.*;
+
+import java.lang.String;
+
+class C {
+
+     A1 a1;
+     A2 a2;
+     A3 a3;
+     A4 a4;
+     A5 a5;
+
+     String myName;
+}
+
 '''
   }