From 28ce43d8fe2e17d87faef60b65eef82a05232f87 Mon Sep 17 00:00:00 2001
From: Dennis Ushakov <dennis.ushakov@gmail.com>
Date: Mon, 16 Apr 2012 15:04:04 +0400
Subject: [PATCH] RUBY-10844

---
 .../com/intellij/refactoring/lang/ExtractIncludeDialog.java    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/platform/lang-impl/src/com/intellij/refactoring/lang/ExtractIncludeDialog.java b/platform/lang-impl/src/com/intellij/refactoring/lang/ExtractIncludeDialog.java
index 4e5aae8824f2..c3a0556e5848 100644
--- a/platform/lang-impl/src/com/intellij/refactoring/lang/ExtractIncludeDialog.java
+++ b/platform/lang-impl/src/com/intellij/refactoring/lang/ExtractIncludeDialog.java
@@ -121,7 +121,8 @@ public class ExtractIncludeDialog extends DialogWrapper {
   private void validateOKButton() {
     final String fileName = myNameField.getText().trim();
     setOKActionEnabled(myTargetDirectoryField.getText().trim().length() > 0 &&
-                       fileName.length() > 0 && fileName.indexOf(File.separatorChar) < 0 && !StringUtil.containsAnyChar(fileName, "*?><\":;|"));
+                       fileName.length() > 0 && fileName.indexOf(File.separatorChar) < 0 &&
+                       !StringUtil.containsAnyChar(fileName, "*?><\":;|") && fileName.indexOf(".") != 0);
   }
 
   private static boolean isFileExist(@NotNull final String directory, @NotNull final String fileName) {