updated for version 7.4.407
Problem:    Inserting text for Visual block mode, with cursor movement,
	    repeats the wrong text. (Aleksandar Ivanov)
Solution:   Reset the update_Insstart_orig flag. (Christian Brabandt)
Added tag v7-4-407 for changeset 3f92ef156c66
updated for version 7.4.408
Problem:    Visual block insert breaks a multi-byte character.
Solution:   Calculate the position properly. (Yasuhiro Matsumoto)
Added tag v7-4-408 for changeset cb3218a69c2f