Core: Add debug messages to dfb_window_repaint() including single window optimisation.
Core: Add debug messages to dfb_window_repaint() including single window optimisation.

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