Ensure context in doc renderer

src/Drawie

@@ -1 +1 @@
-Subproject commit 592622a39992789d96d3ebba580eb3c24298c285
+Subproject commit cb2cdf919db2b9d302bcbcef3a2a434a8d12b00b

src/PixiEditor.ChangeableDocument/Rendering/DocumentRenderer.cs

@@ -273,6 +273,7 @@ public class DocumentRenderer : IPreviewRenderable, IDisposable
         if (isExecuting) return;
 
         isExecuting = true;
+        using var ctx = DrawingBackendApi.Current?.RenderingDispatcher.EnsureContext();
         while (renderRequests.Count > 0)
         {
             RenderRequest request = renderRequests.Dequeue();