Merge pull request #53 from mitchcapper/fix_all_combo_suggestions_shown_incorrectly_pr

Fix combobox from showing all results when should be filtered
Tested the demos and the behavior didn´t change.

Author: quicoli

AutoCompleteTextBox/AutoCompleteTextBox/Editors/AutoCompleteComboBox.cs

@@ -351,7 +351,8 @@ private void Expander_Expanded(object sender, RoutedEventArgs e)
             {
                 _suggestionsAdapter = new SuggestionsAdapter(this);
             }
-            _suggestionsAdapter.ShowFullCollection();
+            if (SelectedItem != null || String.IsNullOrWhiteSpace(Editor.Text))
+                _suggestionsAdapter.ShowFullCollection();
 
         }
 
@@ -540,14 +541,14 @@ public SuggestionsAdapter(AutoCompleteComboBox actb)
 
             public void GetSuggestions(string searchText)
             {
-                _filter = searchText;
                 _actb.IsLoading = true;
                 // Do not open drop down if control is not focused
                 if (_actb.IsKeyboardFocusWithin)
                     _actb.IsDropDownOpen = true;
                 _actb.ItemsSelector.ItemsSource = null;
                 ParameterizedThreadStart thInfo = GetSuggestionsAsync;
                 Thread th = new Thread(thInfo);
+                _filter = searchText;
                 th.Start(new object[] { searchText, _actb.Provider });
             }
             public void ShowFullCollection()