cocoa: Add SDL_HINT_MAC_PRESS_AND_HOLD hint

include/SDL3/SDL_hints.h

@@ -2620,6 +2620,21 @@ extern "C" {
  */
 #define SDL_HINT_MAC_SCROLL_MOMENTUM "SDL_MAC_SCROLL_MOMENTUM"
 
+/**
+ * A variable controlling whether holding down a key will repeat the pressed key
+ * or open the accents menu on macOS.
+ *
+ * The variable can be set to the following values:
+ *
+ * - "0": Holding a key will open the accents menu for that key.
+ * - "1": Holding a key will repeat the pressed key. (default)
+ *
+ * This hint needs to be set before SDL_Init().
+ *
+ * \since This hint is available since SDL 3.4.0.
+ */
+#define SDL_HINT_MAC_PRESS_AND_HOLD "SDL_MAC_PRESS_AND_HOLD"
+
 /**
  * Request SDL_AppIterate() be called at a specific rate.
  *

src/video/cocoa/SDL_cocoaevents.m

@@ -105,10 +105,11 @@ - (void)sendEvent:(NSEvent *)theEvent
 + (void)registerUserDefaults
 {
     BOOL momentumScrollSupported = (BOOL)SDL_GetHintBoolean(SDL_HINT_MAC_SCROLL_MOMENTUM, false);
+    BOOL pressAndHoldEnabled = (BOOL)SDL_GetHintBoolean(SDL_HINT_MAC_PRESS_AND_HOLD, true);
 
     NSDictionary *appDefaults = [[NSDictionary alloc] initWithObjectsAndKeys:
                                                           [NSNumber numberWithBool:momentumScrollSupported], @"AppleMomentumScrollSupported",
-                                                          [NSNumber numberWithBool:YES], @"ApplePressAndHoldEnabled",
+                                                          [NSNumber numberWithBool:pressAndHoldEnabled], @"ApplePressAndHoldEnabled",
                                                           [NSNumber numberWithBool:YES], @"ApplePersistenceIgnoreState",
                                                           nil];
     [[NSUserDefaults standardUserDefaults] registerDefaults:appDefaults];