add discard to menu action

src/DiffEngineTray/MenuBuilder.cs

@@ -138,7 +138,10 @@ static IEnumerable<ToolStripItem> BuildMovesAndDeletes(string? name, Tracker tra
             yield return new MenuButton($"Pending Moves ({moves.Count}):", () => tracker.Accept(moves), Images.Accept);
             foreach (var move in moves)
             {
-                yield return BuildMove(move, () => tracker.Accept(move));
+                yield return BuildMove(
+                    move, 
+                    () => tracker.Accept(move),
+                    () => tracker.Discard(move));
             }
         }
 
@@ -159,6 +162,7 @@ static ToolStripItem BuildMove(TrackedMove move, Action accept)
         var menu = new ToolStripDropDownButton($"{move.Name} ({move.Extension})");
         menu.DropDownDirection = ToolStripDropDownDirection.Left;
         menu.DropDownItems.Add(new MenuButton("Accept move", accept));
+        menu.DropDownItems.Add(new MenuButton("Discard", discard));
         if (move.Exe != null)
         {
             menu.DropDownItems.Add(new MenuButton("Open diff tool", () => DiffToolLauncher.Launch(move)));

src/DiffEngineTray/Tracker.cs

@@ -195,8 +195,18 @@ public void Accept(TrackedMove move)
         }
     }
 
+    public void Discard(TrackedMove move)
+    {
+        if (moves.Remove(move.Target, out var removed))
+        {
+            InnerDiscard(removed);
+        }
+    }
+
     static void InnerMove(TrackedMove move)
     {
+        KillProcesses(move);
+
         if (File.Exists(move.Temp))
         {
             try
@@ -210,8 +220,25 @@ static void InnerMove(TrackedMove move)
                 //writing to the files, and the result will re-add the tracked item
             }
         }
+    }
 
+    static void InnerDiscard(TrackedMove move)
+    {
         KillProcesses(move);
+
+        if (File.Exists(move.Temp))
+        {
+            try
+            {
+                File.Delete(move.Temp);
+            }
+            catch (IOException exception)
+            {
+                Log.Error(exception, $"Filed to delete '{move.Temp}'.");
+                //Swallow this since it is likely that a running test it reading or
+                //writing to the files, and the result will re-add the tracked item
+            }
+        }
     }
 
     static void KillProcesses(TrackedMove move)

src/Directory.Build.props

@@ -2,7 +2,7 @@
 <Project>
   <PropertyGroup>
     <NoWarn>CS1591;CS0649</NoWarn>
-    <Version>6.9.1</Version>
+    <Version>6.9.2</Version>
     <AssemblyVersion>1.0.0</AssemblyVersion>
     <PackageTags>Testing, Snapshot, Diff, Compare</PackageTags>
     <Description>Launches diff tools based on file extensions. Designed to be consumed by snapshot testing libraries.</Description>