[kotlin] refactor "Introduce Variable": use firstIsInstance instead of loop-check

KTIJ-27855

GitOrigin-RevId: d3c2ca95bc8f5d501c1c3dbb151f8c79d7e405a7

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

@@ -478,6 +478,11 @@ public abstract class ExtractionTestGenerated extends AbstractExtractionTest {
                 runTest("testData/refactoring/introduceVariable/IntroduceAndCreateBlock.kt");
             }
 
+            @TestMetadata("IntroduceDestructuringDeclarationAndCreateBlock.kt")
+            public void testIntroduceDestructuringDeclarationAndCreateBlock() throws Exception {
+                runTest("testData/refactoring/introduceVariable/IntroduceDestructuringDeclarationAndCreateBlock.kt");
+            }
+
             @TestMetadata("IntroduceLambdaAndCreateBlock.kt")
             public void testIntroduceLambdaAndCreateBlock() throws Exception {
                 runTest("testData/refactoring/introduceVariable/IntroduceLambdaAndCreateBlock.kt");

plugins/kotlin/idea/tests/testData/refactoring/introduceVariable/IntroduceDestructuringDeclarationAndCreateBlock.kt

@@ -0,0 +1,5 @@
+fun test(n: Int) {
+    if (n > 0) <selection>Dimension(1, 2)</selection>
+}
+
+data class Dimension(val width: Int, val height: Int)

plugins/kotlin/idea/tests/testData/refactoring/introduceVariable/IntroduceDestructuringDeclarationAndCreateBlock.kt.after

@@ -0,0 +1,7 @@
+fun test(n: Int) {
+    if (n > 0) {
+        val (width, height) = Dimension(1, 2)
+    }
+}
+
+data class Dimension(val width: Int, val height: Int)

plugins/kotlin/refactorings/kotlin.refactorings.common/src/org/jetbrains/kotlin/idea/refactoring/introduce/KotlinIntroduceVariableContext.kt

@@ -17,6 +17,8 @@ import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.psi.psiUtil.*
+import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstance
+import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstanceOrNull
 import org.jetbrains.kotlin.utils.exceptions.errorWithAttachment
 import org.jetbrains.kotlin.utils.exceptions.withPsiEntry
 import org.jetbrains.kotlin.utils.sure
@@ -216,11 +218,8 @@ abstract class KotlinIntroduceVariableContext(
                 }
                 emptyBody = anchor.replace(emptyBody) as KtBlockExpression
             }
-            for (child in emptyBody.children) {
-                if (child is KtProperty) {
-                    property = child
-                }
-            }
+            property = emptyBody.children.firstIsInstance<KtDeclaration>()
+
             if (commonContainer is KtContainerNode) {
                 if (commonContainer.parent is KtIfExpression) {
                     val next = commonContainer.nextSibling

plugins/kotlin/refactorings/kotlin.refactorings.introduce.k2/test/org/jetbrains/kotlin/idea/k2/refactoring/introduce/introduceVariable/K2IntroduceVariableTestGenerated.java

@@ -476,6 +476,11 @@ public abstract class K2IntroduceVariableTestGenerated extends AbstractK2Introdu
             runTest("../../idea/tests/testData/refactoring/introduceVariable/IntroduceAndCreateBlock.kt");
         }
 
+        @TestMetadata("IntroduceDestructuringDeclarationAndCreateBlock.kt")
+        public void testIntroduceDestructuringDeclarationAndCreateBlock() throws Exception {
+            runTest("../../idea/tests/testData/refactoring/introduceVariable/IntroduceDestructuringDeclarationAndCreateBlock.kt");
+        }
+
         @TestMetadata("IntroduceLambdaAndCreateBlock.kt")
         public void testIntroduceLambdaAndCreateBlock() throws Exception {
             runTest("../../idea/tests/testData/refactoring/introduceVariable/IntroduceLambdaAndCreateBlock.kt");