Allow SplitAndMove on panes (#38034)

Updates #19350

Release Notes:

- Add `pane::SplitAndMove{Up,Down,Left,Right}` to allow creating a split
without cloning the current buffer.
fcfc54c515Conrad Irwin committed on 9/12/2025, 3:18:28 AM· committed by GitHubparentffb85d7
3 files changedLine totals unavailable