[3.15] gh-50948: IDLE: Warn if saving a file will overwrite a newer version (GH-17578) by miss-islington · Pull Request #151026 · python/cpython

…rsion (pythonGH-17578)

(cherry picked from commit 69851a64076cc240513b834d87d654064f7ac597)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
Co-authored-by: Guilherme Polo <ggpolo@gmail.com>
Co-authored-by: Priya Pappachan <priyapappachan010@gmail.com>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

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