Fbarf_if_buffer_read_only ();
/* Inserting a newline at the end of a line produces better
- redisplay in try_window_id than inserting at the ebginning fo a
+ redisplay in try_window_id than inserting at the beginning of a
line, and the textual result is the same. So, if we're at
beginning of line, pretend to be at the end of the previous line.