Search for KtTypeAlias in safe delete processor

Related to KT-16046

idea/src/org/jetbrains/kotlin/idea/refactoring/safeDelete/KotlinSafeDeleteProcessor.kt

@@ -237,6 +237,10 @@ class KotlinSafeDeleteProcessor : JavaSafeDeleteProcessor() {
             is KtParameter ->
                 findUsagesByJavaProcessor(element)
 
+            is KtTypeAlias -> {
+                findKotlinDeclarationUsages(element)
+            }
+
             else -> null
         } ?: getSearchInfo(element)
     }

idea/testData/refactoring/safeDelete/deleteTypeAlias/kotlinTypeAlias/simple.kt

@@ -0,0 +1 @@
+typealias <caret>MyString = String

idea/testData/refactoring/safeDelete/deleteTypeAlias/kotlinTypeAlias/used.kt

@@ -0,0 +1,7 @@
+typealias <caret>MyString = String
+
+val ms: MyString = ""
+
+class My {
+    val mms: MyString = ""
+}

idea/testData/refactoring/safeDelete/deleteTypeAlias/kotlinTypeAlias/used.kt.messages

@@ -0,0 +1 @@
+type alias MyString has 1 usage that is not safe to delete.

idea/tests/org/jetbrains/kotlin/idea/refactoring/safeDelete/AbstractSafeDeleteTest.java

@@ -91,6 +91,10 @@ public abstract class AbstractSafeDeleteTest extends KotlinLightCodeInsightFixtu
         doTest(path, PsiMethod.class, true);
     }
 
+    public void doTypeAliasTest(@NotNull String path) throws Exception {
+        doTest(path, KtTypeAlias.class, false);
+    }
+
     public void doTypeParameterTest(@NotNull String path) throws Exception {
         doTest(path, KtTypeParameter.class, false);
     }

idea/tests/org/jetbrains/kotlin/idea/refactoring/safeDelete/SafeDeleteTestGenerated.java

@@ -720,6 +720,27 @@ public class SafeDeleteTestGenerated extends AbstractSafeDeleteTest {
         }
     }
 
+    @TestMetadata("idea/testData/refactoring/safeDelete/deleteTypeAlias/kotlinTypeAlias")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class KotlinTypeAlias extends AbstractSafeDeleteTest {
+        public void testAllFilesPresentInKotlinTypeAlias() throws Exception {
+            KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/refactoring/safeDelete/deleteTypeAlias/kotlinTypeAlias"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.ANY, true);
+        }
+
+        @TestMetadata("simple.kt")
+        public void testSimple() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/safeDelete/deleteTypeAlias/kotlinTypeAlias/simple.kt");
+            doTypeAliasTest(fileName);
+        }
+
+        @TestMetadata("used.kt")
+        public void testUsed() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/safeDelete/deleteTypeAlias/kotlinTypeAlias/used.kt");
+            doTypeAliasTest(fileName);
+        }
+    }
+
     @TestMetadata("idea/testData/refactoring/safeDelete/deleteTypeParameter/kotlinTypeParameter")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)