man: OrderedDict mutated in Xonsh

[rsteube]

Current Behavior

Couple of commands seem to interfere with internal completers.

Expected Behavior

Unhandled exception in event loop:
  File "/usr/lib/python3.11/site-packages/prompt_toolkit/buffer.py", line 1920, in new_coroutine
    await coroutine(*a, **kw)
  File "/usr/lib/python3.11/site-packages/prompt_toolkit/buffer.py", line 1744, in async_completer
    async for completion in async_generator:
  File "/usr/lib/python3.11/site-packages/prompt_toolkit/completion/base.py", line 323, in get_completions_async
    async for completion in completer.get_completions_async(
  File "/usr/lib/python3.11/site-packages/prompt_toolkit/completion/base.py", line 199, in get_completions_async
    for item in self.get_completions(document, complete_event):
  File "/usr/lib/python3.11/site-packages/xonsh/ptk_shell/completer.py", line 58, in get_completions
    completions, plen = self.completer.complete(
                        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/xonsh/completer.py", line 121, in complete
    return self.complete_from_context(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/xonsh/completer.py", line 272, in complete_from_context
    for comp in self.generate_completions(
  File "/usr/lib/python3.11/site-packages/xonsh/completer.py", line 177, in generate_completions
    for name, func in XSH.completers.items():

Exception OrderedDict mutated during iteration
Press ENTER to continue...

Steps To Reproduce

1. start xonsh
2. man <tab>

Version

0.28.5

OS

• Linux
• OSX
• Windows

Shell

• Bash
• Elvish
• Fish
• Nushell
• Oil
• Powershell
• Xonsh
• Zsh

Anything else?

No response