Calling debug.debug on Lua freezes the UI

[advantageous-overtake]

Bug summary

Window becomes unresponsive after executing /lua eval debug.debug()

Steps to reproduce

1. run weechat -r "/lua eval debug.debug()"

Current behavior

UI becomes unresponsive, resulting in weechat needing to be killed externally.

https://asciinema.org/a/nKWvykOzguKHNDdHiL4C33wIY

Expected behavior

I don't see why Lua plugins should be able to access the debug library, since its always a source of additional issues.

Suggested solutions

PR #1907

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• WeeChat version: 3.8
• OS, distribution and version: Arch Linux
• Terminal: raw tty
• Terminal multiplexer (screen/tmux/…/none): tmux