[gtk/wip/chergert/macos-iosurface] macos: reduce transaction to swap period

[Christian Hergert <chergert src gnome org>]

commit 8ab50f6ce2f00a86dd46e1e8a751f2b63843a78a
Author: Christian Hergert <christian hergert me>
Date:   Sat Feb 12 04:10:33 2022 -0800

    macos: reduce transaction to swap period
    
    We only need the transaction while we're swapping contents.

 gdk/macos/gdkmacosglcontext.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)
---
diff --git a/gdk/macos/gdkmacosglcontext.c b/gdk/macos/gdkmacosglcontext.c
index 4d455aee05..6e0c794460 100644
--- a/gdk/macos/gdkmacosglcontext.c
+++ b/gdk/macos/gdkmacosglcontext.c
@@ -456,12 +456,6 @@ gdk_macos_gl_context_begin_frame (GdkDrawContext *context,
 
   _gdk_macos_buffer_set_flipped (buffer, TRUE);
 
-  /* Begin a Core Animation transaction so that all changes we
-   * make within the window are seen atomically.
-   */
-  [CATransaction begin];
-  [CATransaction setDisableActions:YES];
-
   /* Create our render target and bind it */
   gdk_gl_context_make_current (GDK_GL_CONTEXT (self));
   gdk_macos_gl_context_allocate (self);
@@ -505,8 +499,12 @@ gdk_macos_gl_context_end_frame (GdkDrawContext *context,
 
   glFlush ();
 
+  /* Begin a Core Animation transaction so that all changes we
+   * make within the window are seen atomically.
+   */
+  [CATransaction begin];
+  [CATransaction setDisableActions:YES];
   _gdk_macos_surface_swap_buffers (GDK_MACOS_SURFACE (surface), painted);
-
   [CATransaction commit];
 }