Introduce Type Alias: Suggest initial name based on extracted type

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/introduceTypeAlias/introduceTypeAliasImpl.kt

@@ -105,7 +105,13 @@ fun IntroduceTypeAliasData.analyze(): IntroduceTypeAliasAnalysisResult {
         return IntroduceTypeAliasAnalysisResult.Error("Type alias cannot refer to types which aren't accessible in the scope where it's defined")
     }
 
-    return IntroduceTypeAliasAnalysisResult.Success(IntroduceTypeAliasDescriptor(this, "", null, typeParameters))
+    val descriptor = IntroduceTypeAliasDescriptor(this, "Dummy", null, typeParameters)
+
+    val initialName = KotlinNameSuggester.suggestTypeAliasNameByPsi(descriptor.generateTypeAlias(true).getTypeReference()!!.typeElement!!) {
+        targetScope.findClassifier(Name.identifier(it), NoLookupLocation.FROM_IDE) == null
+    }
+
+    return IntroduceTypeAliasAnalysisResult.Success(descriptor.copy(name = initialName))
 }
 
 fun IntroduceTypeAliasData.getApplicableVisibilities(): List<KtModifierKeywordToken>{

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/introduceTypeAlias/ui/KotlinIntroduceTypeAliasDialog.java

@@ -21,7 +21,6 @@ import com.intellij.openapi.ui.DialogWrapper;
 import com.intellij.psi.PsiElement;
 import com.intellij.refactoring.ui.NameSuggestionsField;
 import com.intellij.ui.TitledSeparator;
-import com.intellij.util.ArrayUtil;
 import com.intellij.util.containers.MultiMap;
 import kotlin.Unit;
 import kotlin.jvm.functions.Function0;
@@ -143,7 +142,7 @@ public class KotlinIntroduceTypeAliasDialog extends DialogWrapper {
                 }
         );
 
-        aliasNameField = new NameSuggestionsField(ArrayUtil.EMPTY_STRING_ARRAY, project, KotlinFileType.INSTANCE);
+        aliasNameField = new NameSuggestionsField(new String[]{originalDescriptor.getName()}, project, KotlinFileType.INSTANCE);
         aliasNameField.addDataChangedListener(
                 new NameSuggestionsField.DataChanged() {
                     @Override