From 09adbb03ccde8967ca70dfdf296b2dc4f23e67e4 Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Thu, 2 Jun 2016 17:55:33 +0200
Subject: [PATCH] allow bg indexing when copying files/directories
 (IDEA-156849)

---
 .../refactoring/copy/CopyFilesOrDirectoriesHandler.java    | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/platform/lang-impl/src/com/intellij/refactoring/copy/CopyFilesOrDirectoriesHandler.java b/platform/lang-impl/src/com/intellij/refactoring/copy/CopyFilesOrDirectoriesHandler.java
index 10b45c486931..b554eca4f86c 100644
--- a/platform/lang-impl/src/com/intellij/refactoring/copy/CopyFilesOrDirectoriesHandler.java
+++ b/platform/lang-impl/src/com/intellij/refactoring/copy/CopyFilesOrDirectoriesHandler.java
@@ -23,6 +23,8 @@ import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.application.Result;
 import com.intellij.openapi.command.WriteCommandAction;
 import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.project.DumbModePermission;
+import com.intellij.openapi.project.DumbService;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.roots.ProjectRootManager;
 import com.intellij.openapi.ui.Messages;
@@ -101,6 +103,11 @@ public class CopyFilesOrDirectoriesHandler extends CopyHandlerDelegateBase {
   }
 
   public static void copyAsFiles(PsiElement[] elements, @Nullable PsiDirectory defaultTargetDirectory, Project project) {
+    DumbService.allowStartingDumbModeInside(DumbModePermission.MAY_START_BACKGROUND, () ->
+      doCopyAsFiles(elements, defaultTargetDirectory, project));
+  }
+
+  private static void doCopyAsFiles(PsiElement[] elements, @Nullable PsiDirectory defaultTargetDirectory, Project project) {
     PsiDirectory targetDirectory = null;
     String newName = null;
     boolean openInEditor = true;