Don't apply indent on Enter after modifier list

#KT-9562 Fixed

idea/formatter/src/org/jetbrains/kotlin/idea/formatter/KotlinCommonBlock.kt

@@ -237,6 +237,13 @@ abstract class KotlinCommonBlock(
             }
         }
 
+        if (newChildIndex > 0) {
+            val prevBlock = mySubBlocks?.get(newChildIndex - 1)
+            if (prevBlock?.node?.elementType == KtNodeTypes.MODIFIER_LIST) {
+                return ChildAttributes(Indent.getNoneIndent(), null)
+            }
+        }
+
         return when (type) {
             in CODE_BLOCKS, KtNodeTypes.WHEN, KtNodeTypes.IF, KtNodeTypes.FOR, KtNodeTypes.WHILE, KtNodeTypes.DO_WHILE -> ChildAttributes(Indent.getNormalIndent(), null)
 

idea/testData/indentationOnNewline/Annotation.after.kt

@@ -0,0 +1,2 @@
+@Aaaa
+<caret>

idea/testData/indentationOnNewline/Annotation.kt

@@ -0,0 +1 @@
+@Aaaa<caret>

idea/tests/org/jetbrains/kotlin/formatter/TypingIndentationTestBaseGenerated.java

@@ -68,6 +68,12 @@ public class TypingIndentationTestBaseGenerated extends AbstractTypingIndentatio
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/indentationOnNewline"), Pattern.compile("^([^\\.]+)\\.after\\.kt.*$"), TargetBackend.ANY, true);
         }
 
+        @TestMetadata("Annotation.after.kt")
+        public void testAnnotation() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/indentationOnNewline/Annotation.after.kt");
+            doNewlineTest(fileName);
+        }
+
         @TestMetadata("AssignmentAfterEq.after.kt")
         public void testAssignmentAfterEq() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/indentationOnNewline/AssignmentAfterEq.after.kt");