Fix block group output & expand/collapse all

Filtration/ViewModels/ItemFilterBlockGroupViewModel.cs

@@ -166,6 +166,15 @@ namespace Filtration.ViewModels
             }
         }
 
+        public void SetIsExpandedForAll(bool isExpanded)
+        {
+            IsExpanded = isExpanded;
+            foreach(var child in VisibleChildGroups)
+            {
+                child.SetIsExpandedForAll(isExpanded);
+            }
+        }
+
         public void RecalculateCheckState()
         {
             _isShowChecked = DetermineCheckState(true);

Filtration/ViewModels/ToolPanes/BlockGroupBrowserViewModel.cs

@@ -126,7 +126,7 @@ namespace Filtration.ViewModels.ToolPanes
         {
             foreach (var vm in BlockGroupViewModels)
             {
-                vm.IsExpanded = true;
+                vm.SetIsExpandedForAll(true);
             }
         }
 
@@ -134,7 +134,7 @@ namespace Filtration.ViewModels.ToolPanes
         {
             foreach (var vm in BlockGroupViewModels)
             {
-                vm.IsExpanded = false;
+                vm.SetIsExpandedForAll(false);
             }
         }
     }