From 1c4ad499dc344e2b111db152b275bbe5d7cc9a63 Mon Sep 17 00:00:00 2001
From: Ryan Fleury <ryan.j.fleury@gmail.com>
Date: Fri, 9 May 2025 10:51:03 -0700
Subject: [PATCH] prohibit DefWindowProc from running on syschars, for
 everything except alt+space

---
 src/os/gfx/win32/os_gfx_win32.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/os/gfx/win32/os_gfx_win32.c b/src/os/gfx/win32/os_gfx_win32.c
index 8d2698c6..7d04f2c2 100644
--- a/src/os/gfx/win32/os_gfx_win32.c
+++ b/src/os/gfx/win32/os_gfx_win32.c
@@ -489,7 +489,15 @@ os_w32_wnd_proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
       
       case WM_SYSCHAR:
       {
-        result = DefWindowProcW(hwnd, uMsg, wParam, lParam);
+        WORD vk_code = LOWORD(wParam);
+        if(vk_code == VK_SPACE)
+        {
+          result = DefWindowProcW(hwnd, uMsg, wParam, lParam);
+        }
+        else
+        {
+          result = 0;
+        }
       }break;
       
       case WM_CHAR: