From b3fb01c80b0fb6ac8bfe5d3ca90054fb164e407b Mon Sep 17 00:00:00 2001
From: Matej Knopp <matej.knopp@gmail.com>
Date: Wed, 7 Jul 2021 17:56:02 +0200
Subject: [PATCH] MacOS (metal): Block raster thread instead of platform
 thread. (flutter/engine#27191)

---
 .../Source/FlutterResizableBackingStoreProvider.mm         | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/engine/src/flutter/shell/platform/darwin/macos/framework/Source/FlutterResizableBackingStoreProvider.mm b/engine/src/flutter/shell/platform/darwin/macos/framework/Source/FlutterResizableBackingStoreProvider.mm
index 14988a0613f..1d4c2921e83 100644
--- a/engine/src/flutter/shell/platform/darwin/macos/framework/Source/FlutterResizableBackingStoreProvider.mm
+++ b/engine/src/flutter/shell/platform/darwin/macos/framework/Source/FlutterResizableBackingStoreProvider.mm
@@ -78,16 +78,15 @@
 }
 
 - (void)resizeSynchronizerFlush:(nonnull FlutterResizeSynchronizer*)synchronizer {
-  // no-op when using Metal rendering backend.
+  id<MTLCommandBuffer> commandBuffer = [_commandQueue commandBuffer];
+  [commandBuffer commit];
+  [commandBuffer waitUntilScheduled];
 }
 
 - (void)resizeSynchronizerCommit:(nonnull FlutterResizeSynchronizer*)synchronizer {
   [CATransaction begin];
   [CATransaction setDisableActions:YES];
 
-  id<MTLCommandBuffer> commandBuffer = [_commandQueue commandBuffer];
-  [commandBuffer commit];
-  [commandBuffer waitUntilScheduled];
   [_surfaceManager swapBuffers];
 
   [CATransaction commit];