Macro cleanup: USE_ON_FLY_SCROLL

src/nvim/ex_cmds.c

@@ -3949,9 +3949,6 @@ void do_sub(exarg_T *eap)
               ui_cursor_goto(msg_row, msg_col);
               RedrawingDisabled = temp;
 
-#ifdef USE_ON_FLY_SCROLL
-              dont_scroll = FALSE;               /* allow scrolling here */
-#endif
               ++no_mapping;                     /* don't map this key */
               ++allow_keys;                     /* allow special keys */
               typed = plain_vgetc();