Pynput

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* Fall back on `Button.unknown` for unknown mouse buttons in *Xorg* mouse
listener.

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* Added ability to stop event propagation on *Windows*. This will prevent
events from reaching other applications.
* Added ability to ignore events on *Windows*. This is a workaround for systems
where the keyboard monitor interferes with normal keyboard events.
* Added ability to modify events on *OSX*. This allows intercepting and
altering input events before they reach other applications.
* Corrected crash on *OSX* when some types of third party input sources are
installed.

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* Allow catching exceptions thrown from listener callbacks. This changes the
API, as joining a listener now potentially raises unhandled exceptions,
and unhandled exceptions will stop listeners.
* Added support for the numeric keypad on *Linux*.
* Improved documentation.
* Thanks to *jollysean* and *gilleswijnker* for their input!

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* Listen for and dispatch middle button mouse clicks on *Windows*.

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* Corrected bug in ``pynput.keyboard.Controller.pressed`` which caused it to
never release the key. Many thanks to Toby Southwell!

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* Corrected handling of modifier keys to allow them to be composable on
*Linux*.