If the target text can only be found in one line, do not say not found when end of line is reached

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Can search previous within the same line

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
TortoiseGitMerge: Add Search Up direction

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>