KT-12427 Completion doesn't work for "@receiver:" annotation target

#KT-12427 Fixed

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/KeywordCompletion.kt

@@ -272,7 +272,7 @@ object KeywordCompletion {
     private fun buildFilterByText(prefixText: String, project: Project): (KtKeywordToken) -> Boolean {
         val psiFactory = KtPsiFactory(project)
         return fun (keywordTokenType): Boolean {
-            val postfix = if (prefixText.endsWith("@")) ":X" else " X"
+            val postfix = if (prefixText.endsWith("@")) ":X Y.Z" else " X"
             val file = psiFactory.createFile(prefixText + keywordTokenType.value + postfix)
             val elementAt = file.findElementAt(prefixText.length)!!
 

idea/idea-completion/testData/keywords/Receiver.kt

@@ -0,0 +1,3 @@
+fun @<caret>
+
+// EXIST: receiver

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/KeywordCompletionTestGenerated.java

@@ -419,6 +419,12 @@ public class KeywordCompletionTestGenerated extends AbstractKeywordCompletionTes
         doTest(fileName);
     }
 
+    @TestMetadata("Receiver.kt")
+    public void testReceiver() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/keywords/Receiver.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("Return1.kt")
     public void testReturn1() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/keywords/Return1.kt");