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simple precheck clips text examining y(+height), clip y1/y2

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