Drop the tree model before update find account tree view

To avoid delays with large account trees, drop the model from the find
account tree view while it is being updated and then reconnect it after
the model has been updated.

gnucash/gnome/dialog-find-account.c

@@ -156,9 +156,8 @@ gnc_find_account_dialog_close_button_cb (GtkWidget * widget, gpointer user_data)
 }
 
 static void
-fill_model (FindAccountDialog *facc_dialog, Account *account)
+fill_model (GtkTreeModel *model, Account *account)
 {
-    GtkTreeModel *model;
     GtkTreeIter   iter;
     gchar        *fullname = gnc_account_get_full_name (account);
     gint          splits = xaccAccountCountSplits (account, TRUE);
@@ -166,8 +165,6 @@ fill_model (FindAccountDialog *facc_dialog, Account *account)
 
     PINFO("Add to Store: Account '%s'", fullname);
 
-    model = gtk_tree_view_get_model (GTK_TREE_VIEW(facc_dialog->view));
-
     gtk_list_store_append (GTK_LIST_STORE(model), &iter);
 
     gtk_list_store_set (GTK_LIST_STORE(model), &iter,
@@ -187,6 +184,7 @@ get_account_info (FindAccountDialog *facc_dialog)
     GList        *ptr;
     gchar        *filter_text;
     gboolean      radio_root;
+    GtkTreeModel *model;
 
     /* Get the state of the root radio button */
     radio_root = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON(facc_dialog->radio_root));
@@ -201,6 +199,14 @@ get_account_info (FindAccountDialog *facc_dialog)
 
     filter_text = g_ascii_strdown (gtk_entry_get_text (GTK_ENTRY(facc_dialog->filter_text_entry)), -1);
 
+    /* disconnect the model from the treeview */
+    model = gtk_tree_view_get_model (GTK_TREE_VIEW(facc_dialog->view));
+    g_object_ref (G_OBJECT(model));
+    gtk_tree_view_set_model (GTK_TREE_VIEW(facc_dialog->view), NULL);
+
+    // Clear the list store
+    gtk_list_store_clear (GTK_LIST_STORE(model));
+
     /* Go through list of accounts */
     for (ptr = accts; ptr; ptr = g_list_next (ptr))
     {
@@ -209,7 +215,7 @@ get_account_info (FindAccountDialog *facc_dialog)
         gchar   *match_string = g_ascii_strdown (full_name, -1);
 
         if ((g_strcmp0 (filter_text, "") == 0) || (g_strrstr (match_string, filter_text) != NULL))
-            fill_model (facc_dialog, acc);
+            fill_model (model, acc);
 
         g_free (match_string);
         g_free (full_name);
@@ -217,17 +223,16 @@ get_account_info (FindAccountDialog *facc_dialog)
     g_free (filter_text);
     g_list_free (accts);
 
+    /* reconnect the model to the treeview */
+    gtk_tree_view_set_model (GTK_TREE_VIEW(facc_dialog->view), model);
+    g_object_unref(G_OBJECT(model));
+
     gtk_tree_view_columns_autosize (GTK_TREE_VIEW(facc_dialog->view));
 }
 
 static void
 filter_button_cb (GtkButton *button, FindAccountDialog *facc_dialog)
 {
-    GtkTreeModel *model = gtk_tree_view_get_model (GTK_TREE_VIEW(facc_dialog->view));
-
-    // Clear the list store
-    gtk_list_store_clear (GTK_LIST_STORE(model));
-
     get_account_info (facc_dialog);
 
     // Clear the filter