분할창: 동기화된 화면 이동
비교(상위, 왼쪽, 오른쪽 컨트리뷰터)
A
B
L*
B_change1 kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk kkkkkkkkkkkkkkkkkkkkkkkkkkk
R*
B_change2
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
ANCESTOR_CONTRIBUTOR
A
B
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
LEFT_CONTRIBUTOR RIGHT_CONTRIBUTOR
A
*
B_change1
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
A
*
B_change2
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C