fonts: Avoid too many surface switches during one string rendering.
fonts: Avoid too many surface switches during one string rendering.

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