From e55822758e06db8a7dc5605de2dfa988f0d7d30a Mon Sep 17 00:00:00 2001
From: Takashi Sawanaka <sdottaka@users.sourceforge.net>
Date: Sun, 29 Dec 2024 10:49:15 +0900
Subject: [PATCH] Fix issue  #2592: ALT-F4 opens Tools menu instead of exit
 from WinMerge

---
 Src/MenuBar.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Src/MenuBar.cpp b/Src/MenuBar.cpp
index 0ee2b2568a2..7699a844d50 100644
--- a/Src/MenuBar.cpp
+++ b/Src/MenuBar.cpp
@@ -398,7 +398,9 @@ BOOL CMenuBar::PreTranslateMessage(MSG* pMsg)
 			return TRUE;
 		}
 		UINT uId = 0;
-		if ((pMsg->message == WM_SYSKEYDOWN) && GetToolBarCtrl().MapAccelerator(static_cast<TCHAR>(pMsg->wParam), &uId) != 0)
+		const TCHAR key = static_cast<TCHAR>(pMsg->wParam);
+		const bool alnum = (key >= '0' && key <= '9') || (key >= 'A' && key <= 'Z');
+		if ((pMsg->message == WM_SYSKEYDOWN) && alnum && GetToolBarCtrl().MapAccelerator(key, &uId) != 0)
 		{
 			ShowKeyboardCues(true);
 			OnMenuBarMenuItem(uId);