Add mechanism to report status of reparse requests that are canceled before reparse is requested. Closes #4562

Author: comintern

Rubberduck.Core/UI/Command/ReparseCommand.cs

@@ -15,6 +15,12 @@
 
 namespace Rubberduck.UI.Command
 {
+    [ComVisible(false)]
+    public class ReparseCancellationFlag
+    {
+        public bool Canceled { get;  set; }
+    }
+
     [ComVisible(false)]
     public class ReparseCommand : CommandBase
     {
@@ -50,13 +56,21 @@ protected override void OnExecute(object parameter)
             {
                 if (!VerifyCompileOnDemand())
                 {
+                    if (parameter is ReparseCancellationFlag cancellation)
+                    {
+                        cancellation.Canceled = true;
+                    }
                     return;
                 }
 
                 if (AreAllProjectsCompiled(out var failedNames))
                 {
                     if (!PromptUserToContinue(failedNames))
                     {
+                        if (parameter is ReparseCancellationFlag cancellation)
+                        {
+                            cancellation.Canceled = true;
+                        }
                         return;
                     }
                 }

Rubberduck.Core/UI/Inspections/InspectionResultsViewModel.cs

@@ -94,7 +94,12 @@ public InspectionResultsViewModel(
                 {
                     IsRefreshing = true;
                     IsBusy = true;
-                    reparseCommand.Execute(o);
+                    var cancellation = new ReparseCancellationFlag();
+                    reparseCommand.Execute(cancellation);
+                    if (cancellation.Canceled)
+                    {
+                        IsBusy = false;
+                    }
                 },
                 o => !IsBusy && reparseCommand.CanExecute(o));
 
@@ -340,8 +345,6 @@ public bool Unparsed
         private bool _runInspectionsOnReparse;
         private void HandleStateChanged(object sender, ParserStateEventArgs e)
         {
-            Unparsed = false;
-
             if (!IsRefreshing && (_state.Status == ParserState.Pending || _state.Status == ParserState.Error || _state.Status == ParserState.ResolverError))
             {
                 IsBusy = false;
@@ -391,6 +394,8 @@ private async void RefreshInspections(CancellationToken token)
             stopwatch.Stop();
             LogManager.GetCurrentClassLogger().Trace("Inspection results returned in {0}ms", stopwatch.ElapsedMilliseconds);
 
+            Unparsed = false;
+
             _uiDispatcher.Invoke(() =>
             {
                 stopwatch = Stopwatch.StartNew();