fix order of folding-related code execution on editor disposal

previously, relations between fold regions and PSI elements were cleaned
before they could be used to extract folding state for save in
EditorHistoryManager

platform/lang-impl/src/com/intellij/openapi/fileEditor/impl/text/PsiAwareTextEditorImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2017 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.
@@ -97,11 +97,11 @@ public class PsiAwareTextEditorImpl extends TextEditorImpl {
 
     @Override
     public void dispose() {
+      super.dispose();
       CodeFoldingManager foldingManager = CodeFoldingManager.getInstance(myProject);
       if (foldingManager != null) {
         foldingManager.releaseFoldings(getEditor());
       }
-      super.dispose();
     }
 
     @Override