git switch -c move
git mv list.md new-list.md
git switch -c split
git switch -c left
git mv list.md left.md
git commit -am "mv left.md"
Remove unneeded content from left.md
git commit -am "split left.md"
git switch split
git switch -c right
git mv list.md right.md
git commit -am "mv right
Remove unneeded content from right.md
git commit -am "split right.md"
Starting from a branch that has left.md and right.md files
git switch merge
git switch -c left
git mv left.md list.md
git commit -am "split left.md"
git switch merge
git switch -c right
git mv right.md list.md
git commit -am "split right.md"
git switch merge
git merge left right
git cat-file --filters left:list.md >list.md
git cat-file --filters right:list.md >>list.md
git add list.md
git merge --continue