Fix fix menu in inspection results window

The relative source, which works for the context menu, does not for the toolbar menu because the grouping grid is in another branch of the logical tree. Instead, the grouping grid can be referred by name, which does not work for the grouping grid's context menu. Accordingly, a solution with a fallback is employed.

Author: MDoerner

Rubberduck.Core/UI/Inspections/InspectionResultsControl.xaml

@@ -30,7 +30,9 @@
                     <Setter.Value>
                         <MultiBinding Converter="{StaticResource QuickFixCommandParametersToTupleConverter}">
                             <Binding Path="Fix" />
-                            <Binding Path="SelectedItems" RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type controls:GroupingGrid}}" />
+                            <Binding ElementName="InspectionResultsGrid"  Path="SelectedItems" />
+                            <!-- This is a hack to deal with the fact that a named element on the control cannot be accessed from the context menu of the element by name. -->
+                            <Binding Path="SelectedItems" RelativeSource="{RelativeSource  FindAncestor, AncestorType={x:Type controls:GroupingGrid}}" />
                         </MultiBinding>
                     </Setter.Value>
                 </Setter>

Rubberduck.Core/UI/Inspections/QuickFixCommandParametersToTupleConverter.cs

@@ -13,9 +13,15 @@ public class QuickFixCommandParametersToTupleConverter : IMultiValueConverter
     {
         public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
         {
+            //Note: this is necessary for a hack dealing with the fact that a named element on the control cannot be accessed from the context menu of the element by name.
+            var selectedItems = values[1] as IEnumerable
+                                ?? values[2] as IEnumerable
+                                ?? new List<IInspectionResult>();
+
             (IQuickFix quickFix, IEnumerable<IInspectionResult> selectedResults) data = (
                 values[0] as IQuickFix,
-                ((IEnumerable)values[1]).OfType<IInspectionResult>());
+                selectedItems.OfType<IInspectionResult>());
+
             return data;
         }