Prompt-toolkit

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Fixes:
- Fix leaking file descriptors due to not closing the asyncio event loop after
reading input in a thread.
- Fix race condition during retrieval of signatures.

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(Commit 7f619e was missing in previous release.)

Fixes:
- Several fixes to the completion code:
* Give dictionary completions priority over path completions.
* Always call non-fuzzy completer after fuzzy completer to prevent that some
completions were missed out if the fuzzy completer doesn't find them.

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New features:
- When pressing control-w, only delete characters until a punctuation.

Fixes:
- Fix `AttributeError` during retrieval of signatures with type annotations.

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New features:
- Display of signature and completion drop down together.
- If `DictionaryCompleter` is enabled, also retrieve signatures when Jedi
fails, using the same logic.
- List function parameters first and private attributes at the end in the
completion menu.
- Cleanup of the completion code.

Fixes:
- Handle exceptions raised when `repr()` is called.
- Fix leakage of `exc_info` from eval to exec call.
- Fix handling of `KeyboardInterrupt` in REPL during evaluation of `__repr__`.
- Fix style for signature toolbar.
- Hide signature when sidebar is visible.

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New features:
- Added 'print all' option to pager.
- Improve handling of indented code:
* Allow multiline input to be indented as a whole (we will unindent before
executing).
* Correctly visualize tabs (instead of ^I, which happens when pasted in
bracketed paste).

Fixes:
- Fix line ending bug in pager.

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New features:
- Expose a `get_ptpython` function in the global namespace, to get programmatic
access to the REPL.
- Expose `embed()` at the top level of the package. Make it possible to do
`from ptpython import embed`.

Fixes:
- Properly handle exceptions when trying to access `__pt_repr__`.
- Properly handle `SystemExit`.