SDL: Fix key code names for ISO keyboard layouts

From 60dcaff7eb25a01c9c87a5fed335b29a5625b95b Mon Sep 17 00:00:00 2001
From: Cyril Dubet <[EMAIL REDACTED]>
Date: Wed, 5 Apr 2023 01:21:41 +0200
Subject: [PATCH] Fix key code names for ISO keyboard layouts

---
 src/video/cocoa/SDL_cocoakeyboard.m | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/video/cocoa/SDL_cocoakeyboard.m b/src/video/cocoa/SDL_cocoakeyboard.m
index 05cba99386b3..799a29ac5e80 100644
--- a/src/video/cocoa/SDL_cocoakeyboard.m
+++ b/src/video/cocoa/SDL_cocoakeyboard.m
@@ -279,6 +279,17 @@ static void UpdateKeymap(SDL_CocoaVideoData *data, SDL_bool send_event)
                 continue;
             }
 
+            /* 
+             * Swap the scancode for these two wrongly translated keys
+             * UCKeyTranslate() function does not do its job properly for ISO layout keyboards, where the key '@',
+             * which is located in the top left corner of the keyboard right under the Escape key, and the additional
+             * key '<', which is on the right of the Shift key, are inverted
+            */
+            if ((scancode == SDL_SCANCODE_NONUSBACKSLASH || scancode == SDL_SCANCODE_GRAVE) && KBGetLayoutType(LMGetKbdType()) == kKeyboardISO) {
+                /* see comments in scancodes_darwin.h */
+                scancode = (SDL_Scancode)((SDL_SCANCODE_NONUSBACKSLASH + SDL_SCANCODE_GRAVE) - scancode);
+            }
+
             dead_key_state = 0;
             err = UCKeyTranslate((UCKeyboardLayout *)chr_data,
                                  i, kUCKeyActionDown,
@@ -385,7 +396,7 @@ void Cocoa_HandleKeyEvent(_THIS, NSEvent *event)
 #endif
 
     if ((scancode == 10 || scancode == 50) && KBGetLayoutType(LMGetKbdType()) == kKeyboardISO) {
-        /* see comments in SDL_cocoakeys.h */
+        /* see comments in scancodes_darwin.h */
         scancode = 60 - scancode;
     }