[Feature request] Single panel vertical merging feature like in imediff3 or VSCode

[F3llFr0mTh3Sky]

Hello, I'd like to know if you could add a single panel vertical merging feature like in imediff3 or VSCode. It basically should look like this: https://code.visualstudio.com/docs/sourcecontrol/overview?ref=lug.ao.st

For 3+ way merging, I find it way more easy to understand and use than multi panels.

For me VS Code diff and merging is kinda broken so I can't rely on it (it keeps the comment lines <<<< >>>> in the code).