Splitting and Merging panes to/from tabs

[junkblocker]

Is your feature request related to a problem? Please describe.
I'd like the tmux/screen like feature of being able to move a pane out into its own tab and the converse feature of being able to merge a different tab into a new pane in the current tab.

Describe the solution you'd like

An API that looks like

SplitPaneToNewTab
MergePaneFromTab

For reference, the tmux API looks like so

     join-pane [-bdfhv] [-l size] [-s src-pane] [-t dst-pane]
                   (alias: joinp)
             Like split-window, but instead of splitting dst-pane and creating a new pane, split it and move src-pane into the space.  This can be used to reverse break-pane.  The -b option
             causes src-pane to be joined to left of or above dst-pane.

             If -s is omitted and a marked pane is present (see select-pane -m), the marked pane is used rather than the current pane.

    split-window [-bdfhIvP] [-c start-directory] [-e environment] [-l size] [-t target-pane] [shell-command] [-F format]
                  (alias: splitw)
            Create a new pane by splitting target-pane: -h does a horizontal split and -v a vertical split; if neither is specified, -v is assumed.  The -l option specifies the size of the
            new pane in lines (for vertical split) or in columns (for horizontal split); size may be followed by ‘%’ to specify a percentage of the available space.  The -b option causes
            the new pane to be created to the left of or above target-pane.  The -f option creates a new pane spanning the full window height (with -h) or full window width (with -v), in‐
            stead of splitting the active pane.

            An empty shell-command ('') will create a pane with no command running in it.  Output can be sent to such a pane with the display-message command.  The -I flag (if shell-command
            is not specified or empty) will create an empty pane and forward any output from stdin to it.  For example:

                  $ make 2>&1|tmux splitw -dI &

            All other options have the same meaning as for the new-window command.

Describe alternatives you've considered
There are none.

Additional context

[ModProg]

On top of just moving panes into/from tabs, creating new windows from tabs would also be great.

Maybe also moving tabs between windows.

[wez]

In main, wezterm cli split-pane has been extended with easier to understand destination directions (--left, --right), sizes (--cells, --percent) and most relevant to this request: --move-pane-id, which tells it to move an existing pane into the newly created split space:

; wezterm cli split-pane --help
wezterm-cli-split-pane 0.1.0
split the current pane.
Outputs the pane-id for the newly created pane on success

USAGE:
    wezterm cli split-pane [FLAGS] [OPTIONS] [prog]...

FLAGS:
        --bottom        Split vertically, with the new pane on the bottom
    -h, --help          Prints help information
        --horizontal    Equivalent to `--right`. If neither this nor any other direction is specified, the default is
                        equivalent to `--bottom`
        --left          Split horizontally, with the new pane on the left
        --right         Split horizontally, with the new pane on the right
        --top           Split vertically, with the new pane on the top
        --top-level     Rather than splitting the active pane, split the entire window
    -V, --version       Prints version information

OPTIONS:
        --cells <cells>                  The number of cells that the new split should have. If omitted, 50% of the
                                         available space is used
        --cwd <cwd>                      Specify the current working directory for the initially spawned program
        --move-pane-id <move-pane-id>    Instead of spawning a new command, move the specified pane into the newly
                                         created split
        --pane-id <pane-id>              Specify the pane that should be split. The default is to use the current pane
                                         based on the environment variable WEZTERM_PANE
        --percent <percent>              Specify the number of cells that the new split should have, expressed as a
                                         percentage of the available space

ARGS:
    <prog>...    Instead of executing your shell, run PROG. For example: `wezterm cli split-pane -- bash -l` will
                 spawn bash as if it were a login shell

A new command has been added for moving a pane out of its containing tab and into a new tab.
This can also create a new window for that tab:

; wezterm cli move-pane-to-new-tab --help
wezterm-cli-move-pane-to-new-tab 0.1.0
Move a pane into a new tab

USAGE:
    wezterm cli move-pane-to-new-tab [FLAGS] [OPTIONS]

FLAGS:
    -h, --help          Prints help information
        --new-window    Create tab in a new window, rather than the window currently containing the pane
    -V, --version       Prints version information

OPTIONS:
        --pane-id <pane-id>        Specify the pane that should be moved. The default is to use the current pane based
                                   on the environment variable WEZTERM_PANE
        --window-id <window-id>    Specify the window into which the new tab will be created. If omitted, the window
                                   associated with the current pane is used
        --workspace <workspace>    If creating a new window, override the default workspace name with the provided name.
                                   The default name is "default"

[MuhammedZakir]

Maybe remove to-new-tab In move-pane-to-new-tab? As it can move pane to a window too.

Thank you very much for all the work you're doing! :-)

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