Extract Function: Drop extra space in modifier list

#KT-23274 Fixed

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractionEngine/extractorUtil.kt

@@ -65,7 +65,9 @@ private fun buildSignature(config: ExtractionGeneratorConfiguration, renderer: D
         else -> CallableBuilder.Target.READ_ONLY_PROPERTY
     }
     return CallableBuilder(builderTarget).apply {
-        val modifiers = listOf(config.descriptor.visibility) + config.descriptor.modifiers.map { it.value }
+        val visibility = config.descriptor.visibility
+        val extraModifiers = config.descriptor.modifiers.map { it.value }
+        val modifiers = if (visibility.isNotEmpty()) listOf(visibility) + extraModifiers else extraModifiers
         modifier(modifiers.joinToString(separator = " "))
 
         typeParams(

idea/testData/refactoring/extractFunction/basic/extractSuspend.kt

@@ -0,0 +1,9 @@
+// PARAM_DESCRIPTOR: public suspend inline fun <reified T> ExtendMe.receive(): T defined in root package in file extractSuspend.kt
+// PARAM_TYPES: ExtendMe
+suspend inline fun <reified T> ExtendMe.receive(): T = <selection>receive("")</selection> as T
+
+class ExtendMe {
+    suspend fun receive(s: String): Any {
+        return Any()
+    }
+}

idea/testData/refactoring/extractFunction/basic/extractSuspend.kt.after

@@ -0,0 +1,11 @@
+// PARAM_DESCRIPTOR: public suspend inline fun <reified T> ExtendMe.receive(): T defined in root package in file extractSuspend.kt
+// PARAM_TYPES: ExtendMe
+suspend inline fun <reified T> ExtendMe.receive(): T = any() as T
+
+suspend fun ExtendMe.any() = receive("")
+
+class ExtendMe {
+    suspend fun receive(s: String): Any {
+        return Any()
+    }
+}

idea/tests/org/jetbrains/kotlin/idea/refactoring/introduce/ExtractionTestGenerated.java

@@ -935,6 +935,12 @@ public class ExtractionTestGenerated extends AbstractExtractionTest {
                 doExtractFunctionTest(fileName);
             }
 
+            @TestMetadata("extractSuspend.kt")
+            public void testExtractSuspend() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/extractFunction/basic/extractSuspend.kt");
+                doExtractFunctionTest(fileName);
+            }
+
             @TestMetadata("extractToEnumClassBody.kt")
             public void testExtractToEnumClassBody() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/extractFunction/basic/extractToEnumClassBody.kt");