Patch by David Coles.

Patch by Łukasz Langa.

This is how paste work on Windows, Mac, modern Linux apps, and ttk widgets.
The exception was X11 tk widgets.  Original patch by Serhiy Storchake.

Where needed, add minimal tests to cover changes.

Initial patch thanks to Jelle Zijlstra.

Initial patch by ingrid.

This adds support both to pathlib.PurePath's constructor as well as
implementing __fspath__(). This removes the provisional status for
pathlib.

Initial patch by Dusty Phillips.

  unused and outdated icons.

Patch by Arthur Carcano.

positional-only and keyword parameters in the same function.

  unused and outdated icons.

Delete now unneeded tk version tests and code for older versions.

Part of PEP 519.