[PATCH v3 1/4] winex11: Set the scan code prefix when necessary.

[Derek Lesho]

Signed-off-by: Derek Lesho <dlesho at codeweavers.com>
---
 dlls/winex11.drv/keyboard.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dlls/winex11.drv/keyboard.c b/dlls/winex11.drv/keyboard.c
index 131c5f5442..3b7a6fa252 100644
--- a/dlls/winex11.drv/keyboard.c
+++ b/dlls/winex11.drv/keyboard.c
@@ -2077,7 +2077,7 @@ SHORT CDECL X11DRV_VkKeyScanEx(WCHAR wChar, HKL hkl)
  */
 UINT CDECL X11DRV_MapVirtualKeyEx(UINT wCode, UINT wMapType, HKL hkl)
 {
-    UINT ret = 0;
+    UINT ret = 0, prefix = 0;
     int keyc;
     Display *display = thread_init_display();
 
@@ -2107,6 +2107,13 @@ UINT CDECL X11DRV_MapVirtualKeyEx(UINT wCode, UINT wMapType, HKL hkl)
                     break;
                 }
             }
+
+            /* set scan code prefix */
+            if (wCode == VK_RCONTROL || wCode == VK_RMENU)
+                prefix = 0xE0;
+
+            if (wMapType == MAPVK_VK_TO_VSC_EX)
+                ret |= ((prefix << 8) & 0xFF00);
             break;
 
         case MAPVK_VSC_TO_VK: /* scan-code to vkey-code */
-- 
2.23.0