Fixed a weird bug with insertDocument.

Reinserting the same document a large number of time > 100 caused the styles table to explode. 

This should not have happened because each iteration contributes no new style. This has been fixed and tested with reinsertion as large as 1,000 times.
Word 2007 and 2010 has no problem opening these documents... apart from the fact that they are massive > 100MB uncompressed.

DocX/DocX.cs

 
         private void merge_styles(PackagePart remote_pp, PackagePart local_pp, XDocument remote_mainDoc, DocX remote, XDocument remote_footnotes, XDocument remote_endnotes)
         {
+            Dictionary<String, String> local_styles = new Dictionary<string, string>();
+            foreach (XElement local_style in styles.Root.Elements(XName.Get("style", DocX.w.NamespaceName)))
+            {
+                XElement temp = new XElement(local_style);
+                XAttribute styleId = temp.Attribute(XName.Get("styleId", DocX.w.NamespaceName));
+                String value = styleId.Value;
+                styleId.Remove();
+                String key = Regex.Replace(temp.ToString(), @"\s+", "");
+                local_styles.Add(key, value);
+            }
+
             // Add each remote style to this document.
             IEnumerable<XElement> remote_styles = remote.styles.Root.Elements(XName.Get("style", DocX.w.NamespaceName));
-            String guuid = Guid.NewGuid().ToString();
-
             foreach (XElement remote_style in remote_styles)
             {
-                // Need to rename the styleId incase they clash.
-                XAttribute styleId = remote_style.Attribute(XName.Get("styleId", DocX.w.NamespaceName));
-                if (styleId != null)
+                XElement temp = new XElement(remote_style);
+                XAttribute styleId = temp.Attribute(XName.Get("styleId", DocX.w.NamespaceName));
+                String value = styleId.Value;
+                styleId.Remove();
+                String key = Regex.Replace(temp.ToString(), @"\s+", "");
+                String guuid;
+
+                // Check to see if the local document already contains the remote style.
+                if (local_styles.ContainsKey(key))
                 {
-                    foreach(XElement e in remote_mainDoc.Root.Descendants(XName.Get("pStyle", DocX.w.NamespaceName)))
+                    String local_value;
+                    local_styles.TryGetValue(key, out local_value);
+
+                    // If the styleIds are the same then nothing needs to be done.
+                    if (local_value == value)
+                        continue;
+
+                    // All we need to do is update the styleId.
+                    else
                     {
-                        XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
-                        if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
-                        {
-                            e_styleId.SetValue(styleId.Value + "_" + guuid);
-                        }
+                        guuid = local_value;
                     }
+                }
 
-                    foreach (XElement e in remote_mainDoc.Root.Descendants(XName.Get("rStyle", DocX.w.NamespaceName)))
+                else
+                    guuid = Guid.NewGuid().ToString();
+
+                foreach(XElement e in remote_mainDoc.Root.Descendants(XName.Get("pStyle", DocX.w.NamespaceName)))
+                {
+                    XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
+                    if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
+                    {
+                        e_styleId.SetValue(guuid);
+                    }
+                }
+
+                foreach (XElement e in remote_mainDoc.Root.Descendants(XName.Get("rStyle", DocX.w.NamespaceName)))
+                {
+                    XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
+                    if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
+                    {
+                        e_styleId.SetValue(guuid);
+                    }
+                }
+
+                foreach(XElement e in remote_mainDoc.Root.Descendants(XName.Get("tblStyle", DocX.w.NamespaceName)))
+                {
+                    XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
+                    if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
+                    {
+                        e_styleId.SetValue(guuid);
+                    }
+                }
+
+                if (remote_endnotes != null)
+                {
+                    foreach (XElement e in remote_endnotes.Root.Descendants(XName.Get("rStyle", DocX.w.NamespaceName)))
                     {
                         XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
                         if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
                         {
-                            e_styleId.SetValue(styleId.Value + "_" + guuid);
+                            e_styleId.SetValue(guuid);
                         }
                     }
 
-                    foreach(XElement e in remote_mainDoc.Root.Descendants(XName.Get("tblStyle", DocX.w.NamespaceName)))
+                    foreach (XElement e in remote_endnotes.Root.Descendants(XName.Get("pStyle", DocX.w.NamespaceName)))
                     {
                         XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
                         if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
                         {
-                            e_styleId.SetValue(styleId.Value + "_" + guuid);
+                            e_styleId.SetValue(guuid);
                         }
                     }
+                }
 
-                    if (remote_endnotes != null)
+                if (remote_footnotes != null)
+                {
+                    foreach (XElement e in remote_footnotes.Root.Descendants(XName.Get("rStyle", DocX.w.NamespaceName)))
                     {
-                        foreach (XElement e in remote_endnotes.Root.Descendants(XName.Get("rStyle", DocX.w.NamespaceName)))
-                        {
-                            XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
-                            if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
-                            {
-                                e_styleId.SetValue(styleId.Value + "_" + guuid);
-                            }
-                        }
-
-                        foreach (XElement e in remote_endnotes.Root.Descendants(XName.Get("pStyle", DocX.w.NamespaceName)))
+                        XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
+                        if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
                         {
-                            XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
-                            if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
-                            {
-                                e_styleId.SetValue(styleId.Value + "_" + guuid);
-                            }
+                            e_styleId.SetValue(guuid);
                         }
                     }
 
-                    if (remote_footnotes != null)
+                    foreach (XElement e in remote_footnotes.Root.Descendants(XName.Get("pStyle", DocX.w.NamespaceName)))
                     {
-                        foreach (XElement e in remote_footnotes.Root.Descendants(XName.Get("rStyle", DocX.w.NamespaceName)))
-                        {
-                            XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
-                            if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
-                            {
-                                e_styleId.SetValue(styleId.Value + "_" + guuid);
-                            }
-                        }
-
-                        foreach (XElement e in remote_footnotes.Root.Descendants(XName.Get("pStyle", DocX.w.NamespaceName)))
+                        XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
+                        if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
                         {
-                            XAttribute e_styleId = e.Attribute(XName.Get("val", DocX.w.NamespaceName));
-                            if (e_styleId != null && e_styleId.Value.Equals(styleId.Value))
-                            {
-                                e_styleId.SetValue(styleId.Value + "_" + guuid);
-                            }
+                            e_styleId.SetValue(guuid);
                         }
                     }
-
-                    // Make sure they don't clash by using a uuid.
-                    styleId.SetValue(styleId.Value + "_" + guuid);
-                    styles.Root.Add(remote_style);
                 }
+
+                // Make sure they don't clash by using a uuid.
+                styleId.SetValue(guuid);
+                styles.Root.Add(remote_style);  
             }
         }
 

DocX/Properties/AssemblyInfo.cs

 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.12")]
-[assembly: AssemblyFileVersion("1.0.0.12")]
+[assembly: AssemblyVersion("1.0.1.12")]
+[assembly: AssemblyFileVersion("1.0.1.12")]