Profile editor - Fix undo and editor service bugs found by the tests (#913)

* Profile editor - Fix undoing profile editor commands

- Undoing a change to an existing keyframe's value restores the value instead of deleting the keyframe
- Undoing "remove effect" puts the effect back in its place instead of below the next one
- Undoing "toggle keyframes" restores what it was before
- Undoing a brush change on a layer that had no brush removes the brush again, using the new Layer.RemoveLayerBrush
- Undoing "add element" disables the element again
- Undoing an event path change back to no path goes back to an event start node, like a new condition
- MoveProfileElement says "Move folder" for folders
- UpdateLayerProperty without a time no longer calls itself "Add ... keyframe"

* Profile editor - Fix auto-saving, failing commands, suspended editing and smaller editor issues

- A failed auto-save no longer stops auto-saving for the rest of the session
- A failing command is no longer also reported to ReactiveUI as unhandled, on top of the error dialog
- Resuming editing applies the editor's time again right away
- Nothing is focused while editing is suspended
- A layer created on another layer gets a name that isn't in use next to it
- CanUndo and CanRedo start out false, so new subscribers know the state right away
- An empty command scope doesn't add an undo step
- New subscribers to History get the current history once
- Expanding the keyframe selection with an already selected keyframe doesn't add it twice
- Snapping can snap to a snap time of zero

src/Artemis.UI.Shared/Services/ProfileEditor/ProfileEditorService.cs

@@ -56,7 +56,7 @@ internal class ProfileEditorService : IProfileEditorService
         ProfileConfiguration = _profileConfigurationSubject.AsObservable();
         ProfileElement = _profileElementSubject.AsObservable();
         LayerProperty = _layerPropertySubject.AsObservable();
-        History = Observable.Defer(() => Observable.Return(GetHistory(_profileConfigurationSubject.Value))).Concat(ProfileConfiguration.Select(GetHistory));
+        History = ProfileConfiguration.Select(GetHistory);
         Time = _timeSubject.AsObservable();
         Playing = _playingSubject.AsObservable();
         SuspendedEditing = _suspendedEditingSubject.AsObservable();
@@ -101,9 +101,9 @@ internal class ProfileEditorService : IProfileEditorService
         }
         catch (Exception e)
         {
+            // Don't rethrow, that would end the observable that drives auto-saving
             _windowService.ShowExceptionDialog("Failed to auto-save profile", e);
             _logger.Error(e, "Failed to auto-save profile");
-            throw;
         }
 
         return Unit.Default;
@@ -138,8 +138,12 @@ internal class ProfileEditorService : IProfileEditorService
 
     private void ApplyFocusMode()
     {
+        // While editing is suspended the profile plays normally, without focus
         if (_suspendedEditingSubject.Value)
+        {
             _profileService.FocusProfileElement = null;
+            return;
+        }
 
         _profileService.FocusProfileElement = _focusModeSubject.Value switch
         {
@@ -235,10 +239,12 @@ internal class ProfileEditorService : IProfileEditorService
         {
             if (_profileConfigurationSubject.Value != null)
                 _profileService.UpdateFocusProfile = false;
-            Tick(_timeSubject.Value);
         }
 
         _suspendedEditingSubject.OnNext(suspend);
+        // Apply the editor's time again, this only works once editing is no longer suspended
+        if (!suspend)
+            Tick(_timeSubject.Value);
         ApplyFocusMode();
     }
 
@@ -271,7 +277,10 @@ internal class ProfileEditorService : IProfileEditorService
         else
         {
             if (expand)
-                _selectedKeyframes.Add(keyframe);
+            {
+                if (!_selectedKeyframes.Items.Contains(keyframe))
+                    _selectedKeyframes.Add(keyframe);
+            }
             else
                 _selectedKeyframes.Edit(l =>
                 {
@@ -324,9 +333,11 @@ internal class ProfileEditorService : IProfileEditorService
         if (snapTimes != null)
         {
             // Find the closest keyframe
-            TimeSpan closeSnapTime = snapTimes.FirstOrDefault(s => Math.Abs(time.TotalMilliseconds - s.TotalMilliseconds) < tolerance.TotalMilliseconds)!;
-            if (closeSnapTime != TimeSpan.Zero)
-                return closeSnapTime;
+            TimeSpan? closeSnapTime = snapTimes.Where(s => Math.Abs(time.TotalMilliseconds - s.TotalMilliseconds) < tolerance.TotalMilliseconds)
+                .Cast<TimeSpan?>()
+                .FirstOrDefault();
+            if (closeSnapTime != null)
+                return closeSnapTime.Value;
         }
 
         return time;
@@ -368,7 +379,7 @@ internal class ProfileEditorService : IProfileEditorService
     {
         if (target is Layer targetLayer)
         {
-            Layer layer = new(targetLayer.Parent, targetLayer.GetNewLayerName());
+            Layer layer = new(targetLayer.Parent, targetLayer.Parent.GetNewLayerName());
             _layerBrushService.ApplyDefaultBrush(layer);
 
             layer.AddLeds(_deviceService.EnabledDevices.SelectMany(d => d.Leds));
@@ -463,6 +474,10 @@ internal class ProfileEditorService : IProfileEditorService
         ProfileEditorCommandScope scope = _profileEditorHistoryScope;
         _profileEditorHistoryScope = null;
 
+        // Don't add an undo step that does nothing
+        if (!scope.ProfileEditorCommands.Any())
+            return;
+
         // Executing the composite command won't do anything the first time (see last ctor variable)
         // commands were already executed each time they were added to the scope
         ExecuteCommand(new CompositeCommand(scope.ProfileEditorCommands, scope.Name, true));