# HG changeset patch
# User Alexander Simon <alexvsimon@netbeans.org>
# Date 1495807798 -10800
#      Fri May 26 17:09:58 2017 +0300
# Branch release82
# Node ID a49b4303e5818391cb11ea3706304d11864720f7
# Parent  3cf17deffa980fe001ef4aadf53ac50f7100008e
fixed Bug #270748 C/C++ editor destroys groovy editor

diff --git a/cnd.editor/src/org/netbeans/modules/cnd/editor/options/CodeStylePreferencesProvider.java b/cnd.editor/src/org/netbeans/modules/cnd/editor/options/CodeStylePreferencesProvider.java
--- a/cnd.editor/src/org/netbeans/modules/cnd/editor/options/CodeStylePreferencesProvider.java
+++ b/cnd.editor/src/org/netbeans/modules/cnd/editor/options/CodeStylePreferencesProvider.java
@@ -72,8 +72,13 @@
     public static final CodeStylePreferences.Provider INSTANCE = new CodeStylePreferences.Provider() {
         @Override
         public Preferences forFile(FileObject file, String mimeType) {
+            // forFile can be called with (null, null) by infrastructure
+            if (mimeType == null) {              
+                mimeType = file == null ? null : MIMESupport.getSourceFileMIMEType(file);
+            }
             if (mimeType == null) {
-                mimeType = MIMESupport.getSourceFileMIMEType(file);
+              // not accepted 
+              return null;
             }
             if (MIMENames.C_MIME_TYPE.equals(mimeType)) {
                 return NbPreferences.forModule(CodeStyle.class);