automatically refresh graphics elements (#2309)

ErsatzTV.Application/Streaming/Commands/StartFFmpegSessionHandler.cs

@@ -1,6 +1,7 @@
 using System.Threading.Channels;
 using Bugsnag;
 using ErsatzTV.Application.Channels;
+using ErsatzTV.Application.Graphics;
 using ErsatzTV.Application.Maintenance;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
@@ -88,6 +89,8 @@ public class StartFFmpegSessionHandler : IRequestHandler<StartFFmpegSession, Eit
             idleTimeout = Option<TimeSpan>.None;
         }
 
+        await _mediator.Send(new RefreshGraphicsElements(), cancellationToken);
+
         IHlsSessionWorker worker = GetSessionWorker(request, targetFramerate);
 
         _ffmpegSegmenterService.AddOrUpdateWorker(request.ChannelNumber, worker);

ErsatzTV/Pages/PlaybackTroubleshooting.razor

@@ -179,6 +179,7 @@
         _watermarks.Clear();
         _watermarks.AddRange(await Mediator.Send(new GetAllWatermarks(), _cts.Token));
 
+        await Mediator.Send(new RefreshGraphicsElements(), _cts.Token);
         _graphicsElements.Clear();
         _graphicsElements.AddRange(await Mediator.Send(new GetAllGraphicsElements(), _cts.Token));