[jvm-lang] java: don't create private abstract methods (IDEA-186499)

java/java-impl/src/com/intellij/lang/java/actions/CreateMethodAction.kt

@@ -83,11 +83,14 @@ private class JavaMethodRenderer(
   private fun renderMethod(): PsiMethod {
     val method = factory.createMethod(request.methodName, PsiType.VOID)
 
-    var modifiersToRender = requestedModifiers
+    val modifiersToRender = requestedModifiers.toMutableList()
     if (targetClass.isInterface) {
       modifiersToRender -= (visibilityModifiers + JvmModifier.ABSTRACT)
     }
     else if (abstract) {
+      if (modifiersToRender.remove(JvmModifier.PRIVATE)) {
+        modifiersToRender += JvmModifier.PROTECTED
+      }
       modifiersToRender += JvmModifier.ABSTRACT
     }
 

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/createMethodFromUsage/afterAbstractMethodInSameAbstractClass.java

@@ -0,0 +1,8 @@
+// "Create abstract method 'foo' in 'A'" "true"
+abstract class A {
+  void usage() {
+    foo();
+  }
+
+    protected abstract void foo();
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/createMethodFromUsage/beforeAbstractMethodInSameAbstractClass.java

@@ -0,0 +1,6 @@
+// "Create abstract method 'foo' in 'A'" "true"
+abstract class A {
+  void usage() {
+    <caret>foo();
+  }
+}