[GTK4] Update callback.c debugging for GDK4

This was useful for diagnosing
#2703

To test this change you need to uncomment `#define DEBUG_CALL_PRINTS`

Author: jonahgraham

bundles/org.eclipse.swt/Eclipse SWT/common/library/callback.c

@@ -1641,6 +1641,10 @@ JNIEXPORT void JNICALL CALLBACK_NATIVE(unbind)
 	int i;
 	for (i=0; i<MAX_CALLBACKS; i++) {
 		if (callbackData[i].callback != NULL && (*env)->IsSameObject(env, callback, callbackData[i].callback)) {
+			#ifdef DEBUG_CALL_PRINTS
+				fprintf(stderr, "SWT-JNI: Unbinding callback[%02d]\n", i);
+				fflush(stderr);
+			#endif
 			if (callbackData[i].callback != NULL) (*env)->DeleteGlobalRef(env, callbackData[i].callback);
 			if (callbackData[i].object != NULL) (*env)->DeleteGlobalRef(env, callbackData[i].object);
 			memset(&callbackData[i], 0, sizeof(CALLBACK_DATA));
@@ -1863,14 +1867,31 @@ jlong callback(int index, ...)
 				}
 
 				if (!isPrinted && (i == callbackData[index].arg_GdkEvent)) {
-					const GdkEventAny* event = (const GdkEventAny*)arg;
-					fprintf(stderr,
-						"%p [GdkEvent type=%d window=%p [%s]] ",
-						event,
-						event->type,
-						event->window,
-						glibTypeNameFromInstance(event->window)
-					);
+					#if GDK_MAJOR_VERSION == 4
+						GdkEvent* event = (GdkEvent*)arg;
+						fprintf(stderr,
+							"%p [GdkEvent type=%d device=%p [%s] display=%p [%s] surface=%p [%s]] ",
+							event,
+							gdk_event_get_event_type(event),
+							gdk_event_get_device(event),
+							glibTypeNameFromInstance(gdk_event_get_device(event)),
+							gdk_event_get_display(event),
+							glibTypeNameFromInstance(gdk_event_get_display(event)),
+							gdk_event_get_surface(event),
+							glibTypeNameFromInstance(gdk_event_get_surface(event))
+						);
+					#elif GDK_MAJOR_VERSION == 3
+						const GdkEventAny* event = (const GdkEventAny*)arg;
+						fprintf(stderr,
+							"%p [GdkEvent type=%d window=%p [%s]] ",
+							event,
+							event->type,
+							event->window,
+							glibTypeNameFromInstance(event->window)
+						);
+					#else
+						#error Unsupported GDK version
+					#endif
 
 					isPrinted = 1;
 				}