It seems, that const in sdl.h solving problem with quickly open/close teletext and OLED.
One little problem several days - when I am trying quickly open/close teletext, then after some time is not possible teletext open ... I can see, as is opened, but immediately is closed:
debug:
action -> InfobarTeletextActions startTeletext old thread joined 0 TuxTxt 1.114 for 32bpp framebuffer TuxTxt: init ok [TTX] Rendering ended Tuxtxt: plugin ended - double buffering available!
I must zap to next service and back and all works again (or wait some time). It seems, as some is not cleared or what.... but it is not problem, nobody will make it. i think.