Beomgi Kim | 김범기

Results 2 issues of Beomgi Kim | 김범기

**What this PR does / why we need it**: This commit implements the `--backend-snapshot-with-purging-changes` flag. If the above flag is used, changes that are not needed because they are recorded...

**What happened**: In sometimes, only certain sentences were displayed in a different color. ![Screenshot from 2022-08-13 21-52-59](https://user-images.githubusercontent.com/20539422/184495272-779ec4b4-93dc-4013-b3ee-5fc5433a3811.png) **What you expected to happen**: **How to reproduce it (as minimally and precisely...