ENH: implement editable loader with PEP 829 .start files - #881
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on Python 3.15 and later. Editable wheels are Python version specific, thus there is no need to write both a .pth and a .start file for Python versions that support the latter. Editable wheels implemented with .pth files just imported the implementation module and relied on the execution of the module body on import for the installation of the module loader. PEP 829 .start files need to specify a callable that takes no arguments. To keep the difference between .pth and .start file implementations to a minimum, define such callable in the implementation module and switch the .pth file to explicitly call it. Fixes mesonbuild#846
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on Python 3.15 and later. Editable wheels are Python version specific, thus there is no need to write both a .pth and a .start file for Python versions that support the latter.
Editable wheels implemented with .pth files just imported the implementation module and relied on the execution of the module body on import for the installation of the module loader. PEP 829 .start files need to specify a callable that takes no arguments. To keep the difference between .pth and .start file implementations to a minimum, define such callable in the implementation module and switch the .pth file to explicitly call it.
Fixes #846