updated for version 7.4.489
Problem:    Cursor movement still wrong when 'lbr' is set and there is a
	    number column. (Hirohito Higashi)
Solution:   Add correction for number column. (Hiroyuki Takagi)
Added tag v7-4-489 for changeset 31c78e590806
updated for version 7.4.490
Problem:    Cannot specify the buffer to use for "do" and "dp", making them
	    useless for three-way diff.
Solution:   Use the count as the buffer number. (James McCoy)
Added tag v7-4-490 for changeset df92c2b2a179
updated for version 7.4.491
Problem:    When winrestview() has a negative "topline" value there are
	    display errors.
Solution:   Correct a negative value to 1. (Hirohito Higashi)
Added tag v7-4-491 for changeset 5f54e1995751
updated for version 7.4.492
Problem:    In Insert mode, after inserting a newline that inserts a comment
	    leader, CTRL-O moves to the right. (ZyX) Issue 57.
Solution:   Correct the condition for moving the cursor back to the NUL.
	    (Christian Brabandt)
Added tag v7-4-492 for changeset 5e998fc610d5
updated for version 7.4.493
Problem:    A TextChanged autocommand is triggered when saving a file.
	    (William Gardner)
Solution:   Update last_changedtick after calling unchanged(). (Christian
	    Brabandt)
Added tag v7-4-493 for changeset a0daa5feaccb