updated for version 7.3.780
Problem:    char2nr() and nr2char() always use 'encoding'.
Solution:   Add argument to use utf-8 characters. (Yasuhiro Matsumoto)
Added tag v7-3-780 for changeset 42edc5dac33c
updated for version 7.3.781
Problem:    Drawing with 'guifontwide' can be slow.
Solution:   Draw multiple characters at a time. (Taro Muraoka)
Added tag v7-3-781 for changeset 29f29e86602e
updated for version 7.3.782
Problem:    Windows: IME composition may use a wrong font.
Solution:   Use 'guifontwide' for IME when it is set. (Taro Muraoka)
Added tag v7-3-782 for changeset 0de969850c06
updated for version 7.3.783
Problem:    Crash when mark is not set. (Dominique Pelle)
Solution:   Check for NULL.
Added tag v7-3-783 for changeset a80af62d5e3b