From addaa53499cc616c2422f80babb752d3bdf34291 Mon Sep 17 00:00:00 2001
From: "Maxim.Mossienko" <Maxim.Mossienko@jetbrains.com>
Date: Thu, 4 Dec 2014 13:26:16 +0100
Subject: [PATCH] avoid calling getFileType on before content change unless
 absolutely necessary (IDEA-133507)

---
 .../openapi/fileEditor/impl/FileDocumentManagerImpl.java       | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileDocumentManagerImpl.java b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileDocumentManagerImpl.java
index 8d74839e52ba..af229d1abb18 100644
--- a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileDocumentManagerImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileDocumentManagerImpl.java
@@ -748,7 +748,8 @@ public class FileDocumentManagerImpl extends FileDocumentManager implements Virt
   @Override
   public void beforeContentsChange(@NotNull VirtualFileEvent event) {
     VirtualFile virtualFile = event.getFile();
-    if (virtualFile.getFileType() == UnknownFileType.INSTANCE && virtualFile.getLength() == 0) {
+    // check file type in second order to avoid content detection running
+    if (virtualFile.getLength() == 0 && virtualFile.getFileType() == UnknownFileType.INSTANCE) {
       virtualFile.putUserData(MUST_RECOMPUTE_FILE_TYPE, Boolean.TRUE);
     }
   }