winex11.drv: Hack to work around an Xlib bug when XInitThreads is used.

dlls/winex11.drv/x11drv_main.c

diff --git a/dlls/winex11.drv/x11drv_main.c b/dlls/winex11.drv/x11drv_main.c
index ea50cfb..068db14 100644
--- a/dlls/winex11.drv/x11drv_main.c
+++ b/dlls/winex11.drv/x11drv_main.c
@@ -514,7 +514,14 @@
     if (use_xkb)
     {
         use_xkb = XkbUseExtension( data->display, NULL, NULL );
-        if (use_xkb) XkbSetDetectableAutoRepeat( data->display, True, NULL );
+        if (use_xkb)
+        {
+            /* Hack: dummy call to XkbKeysymToModifiers to force initialisation of Xkb internals */
+            /* This works around an Xlib bug where it tries to get the display lock */
+            /* twice during XFilterEvents if Xkb hasn't been initialised yet. */
+            XkbKeysymToModifiers( data->display, 'A' );
+            XkbSetDetectableAutoRepeat( data->display, True, NULL );
+        }
     }
 #endif