Made the project/module files to be written with the same separators they've been read in.

source/com/intellij/openapi/fileEditor/impl/FileDocumentManagerImpl.java

@@ -315,7 +315,7 @@ public class FileDocumentManagerImpl extends FileDocumentManager implements Appl
   }
 
   public String getLineSeparator(VirtualFile file, Project project) {
-    String lineSeparator = file.getUserData(DETECTED_LINE_SEPARATOR_KEY);
+    String lineSeparator = file != null ? file.getUserData(DETECTED_LINE_SEPARATOR_KEY) : null;
     if (lineSeparator == null) {
       CodeStyleSettingsManager settingsManager = project == null
                                                  ? CodeStyleSettingsManager.getInstance()

util/src/com/intellij/openapi/util/JDOMUtil.java

@@ -62,6 +62,10 @@ public class JDOMUtil {
     return w1.toString().equals(w2.toString());
   }
 
+  public static Document loadDocument(char[] chars, int length) throws IOException, JDOMException {
+    SAXBuilder builder = createBuilder();
+    return builder.build(new CharArrayReader(chars, 0, length));
+  }
 
   public static Document loadDocument(File file) throws JDOMException, IOException {
     SAXBuilder saxBuilder = createBuilder();