Add ability to change split order

[janpeterd]

I think an action that can change the order of splits would be a great feature. Currently there is no way to change the order of splits after creating them.

Kitty has something like this called move window.

[rafikdraoui]

Another potential inspiration for such a feature would be Vim. It has default key bindings for:

1. "Rotating" splits (i.e changing the order of the splits while preserving the layout)
2. Moving a split to the right/left/top/bottom of the window
3. Moving a split to a new tab

(c.f. https://neovim.io/doc/user/windows.html#_5.-moving-windows-around)

[ilyagr]

Adding to the list from the previous comment, you'd also want to be able to turn a tab into a split (inside another tab).

Apart from a command for each of these, kitty has a command that asks the user where they want to move the current split (pane in Kitty-split) to. It doesn't have a default binding (which I think is unfortunate), but is configured as:

map kitty_mod+1  detach_window ask

Here's a picture:

There is no option to make a new tab in another window, but this can be achieved by first moving the pane into a tab in that window, and then using a command again to move it into a new tab (in that same window).

tmux join-pane is similar, though I'm not sure it has a nice UI.

(I'm not sure at what point these features should be split into separate discussions and bugs, but it feels right to also have a list of them all in one place and I haven't found a better place)

[SenseiMarv]

To add a bit of context and third-party examples: Here is the GUI solution that iTerm2 has for this in a discussion that I started, which would also play into this: #3747

[H-M-H]

As vim has already been mentioned, it differentiates between buffer, window and tab page:

Summary:
A buffer is the in-memory text of a file.
A window is a viewport on a buffer.
A tab page is a collection of windows.

I thinks this maps neatly to pty, pane and tab page. If attaching and detaching a pty from a pane is possible, it's also easy to move a pty between tabs or even display it in multiple tabs.