[gimp] app: remove early macOS optimizations which are now counter-productive.

[Jehan <jehanp src gnome org>]

commit b889de3ff6982564947dc2798f2565b718f5f2d5
Author: Jehan <jehan girinstud io>
Date:   Thu Feb 17 23:42:57 2022 +0100

    app: remove early macOS optimizations which are now counter-productive.
    
    Basically disabling commit 4f9b7373e6f8.
    After some new patches for GTK3 I wrote, and removing the settings on
    NSViewUsesAutomaticLayerBackingStores, Lukas reported that it works like
    never before, faster than 2.10 even. Note that this could only be tested
    on Monterey, nobody tested on Big Sur with this specific combination
    yet.
    
    In any case, we decided to remove this settings and add the new GTK3
    patches.
    See: https://gitlab.gnome.org/Infrastructure/gimp-macos-build/-/merge_requests/86#note_1384727

 app/gui/gui.c | 13 -------------
 1 file changed, 13 deletions(-)
---
diff --git a/app/gui/gui.c b/app/gui/gui.c
index a968518fca..c2f69af9ea 100644
--- a/app/gui/gui.c
+++ b/app/gui/gui.c
@@ -86,7 +86,6 @@
 #ifdef GDK_WINDOWING_QUARTZ
 #import <AppKit/AppKit.h>
 #include <gtkosxapplication.h>
-#include <gdk/gdkquartz.h>
 
 /* Forward declare since we are building against old SDKs. */
 #if !defined(MAC_OS_X_VERSION_10_12) || \
@@ -274,18 +273,6 @@ gui_init (Gimp        *gimp,
    */
   if ([NSWindow respondsToSelector:@selector(setAllowsAutomaticWindowTabbing:)])
     [NSWindow setAllowsAutomaticWindowTabbing:NO];
-
-  /* MacOS 11 (Big Sur) has added a new, dynamic "accent" as default.
-   * This uses a 10-bit colorspace so every GIMP drawing operation
-   * has the additional cost of an 8-bit (ARGB) to 10-bit conversion.
-   * Let's disable this mode to regain the lost performance.
-   */
-  if (gdk_quartz_osx_version () >= GDK_OSX_BIGSUR)
-    {
-      NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
-      [userDefaults setBool: NO forKey:@"NSViewUsesAutomaticLayerBackingStores"];
-    }
-
 #endif /* GDK_WINDOWING_QUARTZ */
 
   gimp_dnd_init (gimp);