[__DJGPP__ >= 2] (dos_direct_output): Faster method of
writing characters to the screen. (SCREEN_SET_CURSOR): Remove. (IT_display_cursor): New function, to turn the cursor on and off. (IT_cmgoto): New function, sets the cursor to its final position whenever frame update is complete. (internal_terminal_init): Set IT_cmgoto as the hook to be called when frame is up to date. (dos_rawgetc): Call IT_cmgoto instead of the SCREEN_SET_CURSOR macro (which is gone now). (XMenuActivate): Turn off the cursor while the menu is displayed, to prevent it from showing through the menu panes.
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