X11: Fix partial updates in stereo mode.
X11: Fix partial updates in stereo mode.

jcdubois/DirectFB,kevleyski/directfb,lancebaiyouview/DirectFB,dfbdok/DirectFB1,sklnet/DirectFB,deniskropp/DirectFB,kevleyski/DirectFB-1,kevleyski/directfb,kaostao/directfb,Distrotech/DirectFB,DirectFB/directfb,kevleyski/directfb,sklnet/DirectFB,kaostao/directfb,lancebaiyouview/DirectFB,dfbdok/DirectFB1,Distrotech/DirectFB,lancebaiyouview/DirectFB,mtsekm/test,sklnet/DirectFB,kaostao/directfb,kevleyski/DirectFB-1,mtsekm/test,jcdubois/DirectFB,deniskropp/DirectFB,Distrotech/DirectFB,mtsekm/test,deniskropp/DirectFB,kevleyski/DirectFB-1,djbclark/directfb-core-DirectFB,kevleyski/directfb,djbclark/directfb-core-DirectFB,DirectFB/directfb,djbclark/directfb-core-DirectFB,lancebaiyouview/DirectFB,djbclark/directfb-core-DirectFB,sklnet/DirectFB,kevleyski/DirectFB-1,DirectFB/directfb,jcdubois/DirectFB,dfbdok/DirectFB1,deniskropp/DirectFB