Fix for key events filtered by Win32 IME being passed to end-user

src/win32_window.c

@@ -218,6 +218,13 @@ static int translateKey(WPARAM wParam, LPARAM lParam)
         return GLFW_KEY_LEFT_CONTROL;
     }
 
+    if (wParam == VK_PROCESSKEY)
+    {
+        // IME notify of filtered keys by setting the virtual key-code to VK_PROCESSKEY
+
+		return _GLFW_KEY_INVALID;
+    }
+
     return _glfw.win32.publicKeys[HIWORD(lParam) & 0x1FF];
 }