From 296c7a16d3108e1ef6792fa7f81872e477c42adc Mon Sep 17 00:00:00 2001
From: Alexey Sedunov <alexey.sedunov@jetbrains.com>
Date: Thu, 16 Jun 2016 12:54:26 +0300
Subject: [PATCH] Copy: Filter out invalid elements to prevent
 PsiInvalidElementAccessException  #KT-12747 Fixed (cherry picked from commit
 4a0a440)

---
 ChangeLog.md                                                    | 1 +
 .../kotlin/idea/refactoring/copy/CopyKotlinFileHandler.kt       | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/ChangeLog.md b/ChangeLog.md
index 321a68cbd21..0cf5a1b24df 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -248,6 +248,7 @@
 - [`KT-10687`](https://youtrack.jetbrains.com/issue/KT-10687) Qualify property references to avoid shadowing by parameters
 - [`KT-12543`](https://youtrack.jetbrains.com/issue/KT-12543) Qualify property references with 'this' to avoid renaming conflicts
 - [`KT-12732`](https://youtrack.jetbrains.com/issue/KT-12732) Copy default parameter values to overriding function which is renamed by Java reference while its base function is unchanged
+- [`KT-12747`](https://youtrack.jetbrains.com/issue/KT-12747) Fix exception on file copy
 
 #### Java to Kotlin converter
 
diff --git a/idea/src/org/jetbrains/kotlin/idea/refactoring/copy/CopyKotlinFileHandler.kt b/idea/src/org/jetbrains/kotlin/idea/refactoring/copy/CopyKotlinFileHandler.kt
index 5a954f38730..6031f8a9c54 100644
--- a/idea/src/org/jetbrains/kotlin/idea/refactoring/copy/CopyKotlinFileHandler.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/refactoring/copy/CopyKotlinFileHandler.kt
@@ -27,7 +27,7 @@ class CopyKotlinFileHandler : CopyHandlerDelegateBase() {
 
     private fun adjustElements(elements: Array<out PsiElement>): Array<PsiElement>? {
         return elements
-                .map { it.containingFile as? KtFile ?: return null }
+                .map { (if (it.isValid) it.containingFile as? KtFile else null) ?: return null }
                 .toTypedArray()
     }