I have 2 branches, for example branch A and B and enter the command
git rebase A B
Then conflicts occur and use
git mergetool
and have meld for mergetool.
Now Meld opens with 3 panes, left, center and right. I don't exactly understand what is displayed in each pane. I have found similar resources but not for rebasing. And also after having finished with the merge what is my goal :
Left panel is the file as it is in branch A of your example
Right panel is the file as it is in branch B of your example
Central panel is "merge" result where you can choose, from left, right, or editing directly, what to keep.