From 4b1696ced320360c8490d453ca407145b4ed0f4e Mon Sep 17 00:00:00 2001
From: Ouchihao <ou727963665@gmail.com>
Date: Fri, 4 Sep 2026 16:32:12 +0800
Subject: [PATCH] fix(tsf): pass application modifier shortcuts through

---
 src/Key/KeyEventSink.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/Key/KeyEventSink.cpp b/src/Key/KeyEventSink.cpp
index ef0cb720..747fccfd 100644
--- a/src/Key/KeyEventSink.cpp
+++ b/src/Key/KeyEventSink.cpp
@@ -711,6 +711,15 @@ BOOL CMetasequoiaIME::_IsKeyEaten(        //
             return TRUE;
         }
 
+        // Other Ctrl/Alt/Windows combinations belong to the application.
+        // IME-owned shortcuts are handled before this normal key classifier.
+        if ((shortcutModifiers & 0b00000110u) != 0 ||
+            (GetAsyncKeyState(VK_LWIN) & 0x8000) != 0 ||
+            (GetAsyncKeyState(VK_RWIN) & 0x8000) != 0)
+        {
+            return isTouchKeyboardSpecialKeys;
+        }
+
         const bool isComposing = freshCompositionState ? false : _IsComposing() != FALSE;
         const CANDIDATE_MODE candidateMode =
             freshCompositionState ? CANDIDATE_NONE : _candidateMode;