Stop churning results on filter and group, freshen up toolbar.

Author: comintern

Rubberduck.Core/UI/Inspections/InspectionFilterToBooleanConverter.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace Rubberduck.UI.Inspections
+{
+    internal class InspectionFilterToBooleanConverter : IValueConverter
+    {
+        private InspectionResultsFilter _state;
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(parameter is InspectionResultsFilter flag) ||
+                !(value is InspectionResultsFilter bound))
+            {
+                return _state;
+            }
+
+            _state = bound;
+            return _state.HasFlag(flag);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(parameter is InspectionResultsFilter flag) ||
+                !(value is bool isSet))
+            {
+                return _state;
+            }
+
+            _state ^= flag;
+            return _state;
+        }       
+    }
+}