isCaseSensitive method

xml/xml-psi-impl/src/com/intellij/ide/highlighter/XHtmlFileType.java

@@ -51,4 +51,9 @@ public class XHtmlFileType extends HtmlFileType {
   public Icon getIcon() {
     return AllIcons.FileTypes.Xhtml;
   }
+
+  @Override
+  public boolean isCaseSensitive() {
+    return true;
+  }
 }

xml/xml-psi-impl/src/com/intellij/ide/highlighter/XmlLikeFileType.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2009 JetBrains s.r.o.
+ * Copyright 2000-2013 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,4 +42,8 @@ public abstract class XmlLikeFileType extends LanguageFileType {
     Charset charset = CharsetToolkit.forName(name);
     return charset == null ? CharsetToolkit.UTF8_CHARSET : charset;
   }
+
+  public boolean isCaseSensitive() {
+    return false;
+  }
 }