SDL: IBus should use ev keycode instead of X keycode

SDL Commits
1 
From ff5b67e5e0951230d2ea4c1ac9c9f7179f975b86 Mon Sep 17 00:00:00 2001
From: Weng Xuetian <[EMAIL REDACTED]>
Date: Sun, 30 Jan 2022 16:29:05 -0800
Subject: [PATCH] IBus should use ev keycode instead of X keycode

See: https://github.com/ibus/ibus/blob/5a455b1ead5d72483952356ddfe25b9e3b637e6f/client/gtk2/ibusimcontext.c#L468
---
 src/core/linux/SDL_ibus.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/core/linux/SDL_ibus.c b/src/core/linux/SDL_ibus.c
index a7bafda358b..20236e71387 100644
--- a/src/core/linux/SDL_ibus.c
+++ b/src/core/linux/SDL_ibus.c
@@ -510,8 +510,9 @@ SDL_IBus_ProcessKeyEvent(Uint32 keysym, Uint32 keycode)
     
     if (IBus_CheckConnection(dbus)) {
         Uint32 mods = IBus_ModState();
+        Uint32 ibus_keycode = keycode - 8;
         if (!SDL_DBus_CallMethodOnConnection(ibus_conn, IBUS_SERVICE, input_ctx_path, IBUS_INPUT_INTERFACE, "ProcessKeyEvent",
-                DBUS_TYPE_UINT32, &keysym, DBUS_TYPE_UINT32, &keycode, DBUS_TYPE_UINT32, &mods, DBUS_TYPE_INVALID,
+                DBUS_TYPE_UINT32, &keysym, DBUS_TYPE_UINT32, &ibus_keycode, DBUS_TYPE_UINT32, &mods, DBUS_TYPE_INVALID,
                 DBUS_TYPE_BOOLEAN, &result, DBUS_TYPE_INVALID)) {
             result = 0;
         }