Fix for multiple files with the same name.

When multiple files with the same filename, but different path, appear
in the same solution, all files will be displayed. Duplicates of the
same file path will still be removed.

e.g. C:\Foo\Bar.h and C:\Baz\Bar.h will both be shown. However, if
C:\Foo\Bar.h is referenced twice it will only be shown once.

Author: akb825

OpenFileInSolutionPackage.cs

@@ -45,7 +45,7 @@ public bool Equals(ProjectItemWrapper x, ProjectItemWrapper y)
 
         public int GetHashCode(ProjectItemWrapper obj)
         {
-            return obj.Filename.GetHashCode();
+            return obj.Path.GetHashCode();
         }
     }
 
@@ -180,7 +180,7 @@ private IEnumerable<ProjectItemWrapper> EnumerateProjectItems(ProjectItems items
                 for (int i = 1; i <= items.Count; i++)
                 {
                     var itm = items.Item(i);
-                    
+
                     foreach (var res in EnumerateProjectItems(itm.ProjectItems))
                     {
                         yield return res;
@@ -228,9 +228,9 @@ private void MenuItemCallback(object sender, EventArgs e)
             {
                 foreach (var item in EnumerateProjectItems(proj.ProjectItems))
                 {
-                    if (!projItems.ContainsKey(item.Filename))
+                    if (!projItems.ContainsKey(item.Path))
                     {
-                        projItems.Add(item.Filename, item);
+                        projItems.Add(item.Path, item);
                     }
                 }
             }