From 3fb4f7efeebbb67c8c3fecb9d79893aba1f54a55 Mon Sep 17 00:00:00 2001
From: Dmitry Avdeev <Dmitry.Avdeev@jetbrains.com>
Date: Fri, 26 Dec 2014 15:26:26 +0300
Subject: [PATCH] detecting facelets after dumb mode

---
 .../psi/impl/file/impl/FileManagerImpl.java   | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/platform/core-impl/src/com/intellij/psi/impl/file/impl/FileManagerImpl.java b/platform/core-impl/src/com/intellij/psi/impl/file/impl/FileManagerImpl.java
index b4dda74e39a6..a34c2c8b5539 100644
--- a/platform/core-impl/src/com/intellij/psi/impl/file/impl/FileManagerImpl.java
+++ b/platform/core-impl/src/com/intellij/psi/impl/file/impl/FileManagerImpl.java
@@ -126,10 +126,24 @@ public class FileManagerImpl implements FileManager {
           }
         }
         removeInvalidFilesAndDirs(false);
+        checkLanguageChange();
       }
     });
   }
 
+  private void checkLanguageChange() {
+    Map<VirtualFile, FileViewProvider> fileToPsiFileMap = new THashMap<VirtualFile, FileViewProvider>(myVFileToViewProviderMap);
+    myVFileToViewProviderMap.clear();
+    for (Iterator<VirtualFile> iterator = fileToPsiFileMap.keySet().iterator(); iterator.hasNext();) {
+      VirtualFile vFile = iterator.next();
+      Language language = getLanguage(vFile);
+      if (language != null && language != fileToPsiFileMap.get(vFile).getBaseLanguage()) {
+        iterator.remove();
+      }
+    }
+    myVFileToViewProviderMap.putAll(fileToPsiFileMap);
+  }
+
   public void forceReload(@NotNull VirtualFile vFile) {
     if (findCachedViewProvider(vFile) == null) {
       return;
@@ -231,6 +245,11 @@ public class FileManagerImpl implements FileManager {
   @NotNull
   public FileViewProvider createFileViewProvider(@NotNull final VirtualFile file, boolean eventSystemEnabled) {
     Language language = getLanguage(file);
+    return createFileViewProvider(file, eventSystemEnabled, language);
+  }
+
+  @NotNull
+  private FileViewProvider createFileViewProvider(@NotNull VirtualFile file, boolean eventSystemEnabled, Language language) {
     final FileViewProviderFactory factory = language == null
                                             ? FileTypeFileViewProviders.INSTANCE.forFileType(file.getFileType())
                                             : LanguageFileViewProviders.INSTANCE.forLanguage(language);