Merge pull request #11605 from AvaloniaUI/fixes/compositor-commit-issues

Fixes for compositor commit issues

src/Avalonia.Base/Media/MediaContext.Compositor.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Threading.Tasks;
 using Avalonia.Platform;
 using Avalonia.Rendering.Composition;
@@ -78,7 +79,7 @@ partial class MediaContext
             // Nothing to do, and there are no pending commits
             return false;
         
-        foreach (var c in _requestedCommits)
+        foreach (var c in _requestedCommits.ToArray())
             CommitCompositor(c);
         
         _requestedCommits.Clear();

src/Avalonia.Base/Rendering/Composition/Compositor.cs

@@ -130,7 +130,7 @@ namespace Avalonia.Rendering.Composition
             Dispatcher.UIThread.VerifyAccess();
             using var noPump = NonPumpingLockHelper.Use();
             
-            _nextCommit ??= new();
+            var commit = _nextCommit ??= new();
 
             (_invokeBeforeCommitRead, _invokeBeforeCommitWrite) = (_invokeBeforeCommitWrite, _invokeBeforeCommitRead);
             while (_invokeBeforeCommitRead.Count > 0)
@@ -188,7 +188,7 @@ namespace Avalonia.Rendering.Composition
                 }, TaskContinuationOptions.ExecuteSynchronously);
                 _nextCommit = null;
                 
-                return _pendingBatch;
+                return commit;
             }
         }