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Title: gh-69134: Harden tkinter GUI tests that depend on a mapped widget by serhiy-storchaka · Pull Request #152499 · python/cpython · GitHub

Open Graph Title: gh-69134: Harden tkinter GUI tests that depend on a mapped widget by serhiy-storchaka · Pull Request #152499 · python/cpython

X Title: gh-69134: Harden tkinter GUI tests that depend on a mapped widget by serhiy-storchaka · Pull Request #152499 · python/cpython

Description: Several ttk and tkinter tests query realized geometry (winfo_width(), identify(), coords(), place_info(), ...) right after a bare update(), which does not guarantee that the window manager has mapped and sized the widget. Under a tiling window manager or a headless/contended display the widget can still have a 1x1 size, so identify() returns the empty string and coordinate-based assertions fail intermittently. This adds a wait_until_mapped() helper (and an AbstractTkTest.require_mapped() wrapper) to test_tkinter.support that waits, with a bounded timeout, for the widget to be mapped with a non-trivial size. Unlike Misc.wait_visibility() it never blocks indefinitely (see bpo-40722). It is used to guard only the assertions that need a mapped widget, so the remaining checks still run, and the empty string that several identify() tests accepted solely to tolerate an unmapped widget is dropped. Issue: gh-69134

Open Graph Description: Several ttk and tkinter tests query realized geometry (winfo_width(), identify(), coords(), place_info(), ...) right after a bare update(), which does not guarantee that the window manager has mapp...

X Description: Several ttk and tkinter tests query realized geometry (winfo_width(), identify(), coords(), place_info(), ...) right after a bare update(), which does not guarantee that the window manager has mapp...

Opengraph URL: https://github.com/python/cpython/pull/152499

X: @github

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af604a0 gh-69134: Harden tkinter GUI tests that depend on a mapped widget serhiy-storchaka Jun 28, 2026 https://github.com/python/cpython/pull/152499/commits/af604a0107517437470ff2c466e5f594457ec962
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