Closing the last pane in the second tab crashes wezterm

[ModProg]

Describe the bug

When closing the last pane in a tab other than the first one, e.g. with:

    {key="q", mods="CTRL", action=wezterm.action{
      CloseCurrentPane={confirm=false}
    }},

Wezterm closes without actually exiting, and without any error message.

Environment (please complete the following information):

• OS: Linux Wayland
• Version: wezterm 20210617-233305-618f77f2
• DE

To Reproduce

• Open a new Tab
• Press "CTRL+q"
• Enjoy

Configuration

local wezterm = require 'wezterm';
return {
  keys = {
    {key="q", mods="CTRL", action=wezterm.action{
      CloseCurrentPane={confirm=false}
    }},
  }
}

Expected behavior

It should only close the currently opened tab

[wez]

What does wezterm log to stderr when this happens?

[ModProg]

What does wezterm log to stderr when this happens?

Nothing:

❯ wezterm
 2021-06-19T16:48:00.553Z INFO  wezterm_mux_server_impl::local
> setting up /run/user/1000/wezterm/gui-sock-58943
 2021-06-19T16:48:00.624Z INFO  wezterm_gui::termwindow
> OpenGL initialized! Mesa Intel(R) UHD Graphics 620 (KBL GT2)
OpenGL ES 3.2 Mesa 21.1.1 is_context_loss_possible=false wezterm version: 20210617-233305-618f77f2
^C⏎
~ took 15s
❯

[wez]

Interesting: it's not crashing (it's still running), but the window gets closed

[github-actions]

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