Move: Make applicable to type aliases

#KT-21071 Fixed

idea/src/org/jetbrains/kotlin/idea/refactoring/move/moveDeclarations/MoveKotlinDeclarationsHandler.kt

@@ -172,7 +172,7 @@ class MoveKotlinDeclarationsHandler : MoveHandlerDelegate() {
 
         return elements.all { e ->
             when {
-                e is KtClass || e is KtObjectDeclaration && !e.isObjectLiteral() || e is KtNamedFunction || e is KtProperty ->
+                e is KtClass || e is KtObjectDeclaration && !e.isObjectLiteral() || e is KtNamedFunction || e is KtProperty || e is KtTypeAlias ->
                     (editorMode || (e as KtNamedDeclaration).canMove()) && e.canRefactor()
                 e is KtFile ->
                     e.declarations.any { it is KtNamedDeclaration } && e.canRefactor()

idea/testData/refactoring/moveHandler/declarations/typeAlias/test.kt

@@ -0,0 +1,3 @@
+class A
+
+typealias <caret>B = A

idea/tests/org/jetbrains/kotlin/idea/refactoring/move/MoveKotlinDeclarationsHandlerTest.kt

@@ -198,4 +198,9 @@ class MoveKotlinDeclarationsHandlerTest : KotlinMultiFileTestCase() {
         assert(nestedTarget.name == "C")
         assert(handler.canMove(elementsToMove, nestedTarget))
     }
+
+    fun testTypeAlias() = doTest { rootDir, handler ->
+        val typeAlias = getElementAtCaret(rootDir, "test.kt").getNonStrictParentOfType<KtTypeAlias>()!!
+        assert(handler.canMove(arrayOf<PsiElement>(typeAlias), null))
+    }
 }