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update_single_line() was only used for 'concealcursor'. But 'cursorline' has very similiar characteristics (redraw both lines on move cursor between lines) and works without its own special entry point to the redraw subsystem. Later on 'concealcursor' and 'cursorline' could share more logic, but for now make the former use standard redrawWinline(). Make sure it is called before update_screen(), so that it is immediately visible. Get rid of update_prepare() and update_finish(), and all issues from them and their callsites not being in sync with changes to update_screen()