Prompt-toolkit

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Fixes:
- Fix regression regarding IPython input hook (%gui) integration.

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Fixes:
- Improved Python 3.12 support (fixes event loop `DeprecationWarning`).

New features:
- Vi key bindings: `control-t` and `control-d` for indent/unindent in insert
mode.
- Insert partial suggestion when `control+right` is pressed, similar to Fish.
- Use sphinx-nefertiti theme for the docs.

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Fixes:
- Fix `RuntimeError` when `__breakpointhook__` is called from another thread.
- Fix memory leak in filters usage.
- Ensure that key bindings are handled in the right context (when using
contextvars).

New features:
- Accept `in_thread` keyword in `prompt_toolkit.shortcuts.prompt()`.
- Support the `NO_COLOR` environment variable.

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Fixes:
- Fix regression in filters. (Use of `WeakValueDictionary` caused filters to
not be cached).

New features:
- Use 24-bit true color now by default on Windows 10/11.

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Bug fixes:
- Fix `currentThread()` deprecation warning.
- Fix memory leak in filters.
- Make VERSION tuple numeric.

New features:
- Add `.run()` method in `TelnetServer`. (To be used instead of
`.start()/.stop()`.

Breaking changes:
- Subclasses of `Filter` have to call `super()` in their `__init__`.
- Drop support for Python 3.6:
* This includes code cleanup for Python 3.6 compatibility.
* Use `get_running_loop()` instead of `get_event_loop()`.
* Use `asyncio.run()` instead of `asyncio.run_until_complete()`.

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Fixes:
- Another Python 3.6 fix for a bug that was introduced in 3.0.34.