[glom] FoundSet: Remove unused broken operator=().

[Murray Cumming <murrayc src gnome org>]

commit ad76bff06cfd4d68c9ebf18ba1f1270ca0afccd6
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Nov 5 21:11:50 2013 +0100

    FoundSet: Remove unused broken operator=().

 glom/libglom/data_structure/foundset.cc |    8 --------
 glom/libglom/data_structure/foundset.h  |    4 ++++
 2 files changed, 4 insertions(+), 8 deletions(-)
---
diff --git a/glom/libglom/data_structure/foundset.cc b/glom/libglom/data_structure/foundset.cc
index 0412d7f..031fa6b 100644
--- a/glom/libglom/data_structure/foundset.cc
+++ b/glom/libglom/data_structure/foundset.cc
@@ -45,12 +45,4 @@ FoundSet& FoundSet::operator=(const FoundSet& src)
   return *this;
 }
 
-bool FoundSet::operator==(const FoundSet& src) const
-{
-  return (m_table_name == src.m_table_name)
-      && (m_extra_join == src.m_extra_join)
-      /* TODO: && (m_where_clause == src.m_where_clause) */
-      && (m_sort_clause == src.m_sort_clause);
-}
-
 } //namespace Glom
diff --git a/glom/libglom/data_structure/foundset.h b/glom/libglom/data_structure/foundset.h
index e2b3f62..e3949af 100644
--- a/glom/libglom/data_structure/foundset.h
+++ b/glom/libglom/data_structure/foundset.h
@@ -41,8 +41,12 @@ public:
   FoundSet(const FoundSet& src);
   FoundSet& operator=(const FoundSet& src);
 
+private:
+  //We cannot implement this without a way to compare GdaSqlExpr instances,
+  //but luckily we don't need to compare FoundSet instances anyway.
   bool operator==(const FoundSet& src) const;
 
+public:
   Glib::ustring m_table_name;
   sharedptr<const Relationship> m_extra_join; // Only used for doubly-related related records (portals), in 
which case the WHERE clause is also slightly different.
   Gnome::Gda::SqlExpr m_where_clause;