SDL: Fix For issue #6948 (#6991)

From 59ad6793b9ec900352cc3d756d6f3062a3ccb525 Mon Sep 17 00:00:00 2001
From: Matt Durgavich <[EMAIL REDACTED]>
Date: Thu, 5 Jan 2023 11:54:27 -0500
Subject: [PATCH] Fix For issue #6948 (#6991)

MessageBoxes attached to a window in macOS should use modal APIs and not
use a poll/sleep pattern on the main thread. Sleeping the main thread
makes the NSWindow message loop sluggish and interferes with external
applications that need to send messages to that window, such as
VoiceOver.
---
 src/video/cocoa/SDL_cocoamessagebox.m | 34 ++++-----------------------
 1 file changed, 5 insertions(+), 29 deletions(-)

diff --git a/src/video/cocoa/SDL_cocoamessagebox.m b/src/video/cocoa/SDL_cocoamessagebox.m
index 2a8815564dc3..0684cf249008 100644
--- a/src/video/cocoa/SDL_cocoamessagebox.m
+++ b/src/video/cocoa/SDL_cocoamessagebox.m
@@ -31,7 +31,6 @@ @interface SDLMessageBoxPresenter : NSObject
     NSWindow *nswindow;
 }
 - (id)initWithParentWindow:(SDL_Window *)window;
-- (void)alertDidEnd:(NSAlert *)alert returnCode:(NSInteger)returnCode contextInfo:(void *)contextInfo;
 @end
 
 @implementation SDLMessageBoxPresenter
@@ -55,39 +54,16 @@ - (id)initWithParentWindow:(SDL_Window *)window
 - (void)showAlert:(NSAlert *)alert
 {
     if (nswindow) {
-#ifdef MAC_OS_X_VERSION_10_9
-        if ([alert respondsToSelector:@selector(beginSheetModalForWindow:completionHandler:)]) {
-            [alert beginSheetModalForWindow:nswindow
-                          completionHandler:^(NSModalResponse returnCode) {
-                            self->clicked = returnCode;
-                          }];
-        } else
-#endif
-        {
-#if MAC_OS_X_VERSION_MIN_REQUIRED < 1090
-            [alert beginSheetModalForWindow:nswindow
-                              modalDelegate:self
-                             didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:)
-                                contextInfo:nil];
-#endif
-        }
-
-        while (clicked < 0) {
-            SDL_PumpEvents();
-            SDL_Delay(100);
-        }
-
+        [alert beginSheetModalForWindow:nswindow
+                      completionHandler:^(NSModalResponse returnCode) {
+                        [NSApp stopModalWithCode:returnCode];
+                      }];
+        clicked = [NSApp runModalForWindow:nswindow];
         nswindow = nil;
     } else {
         clicked = [alert runModal];
     }
 }
-
-- (void)alertDidEnd:(NSAlert *)alert returnCode:(NSInteger)returnCode contextInfo:(void *)contextInfo
-{
-    clicked = returnCode;
-}
-
 @end
 
 static void Cocoa_ShowMessageBoxImpl(const SDL_MessageBoxData *messageboxdata, int *buttonid, int *returnValue)