gh-153422: Return bool from some tkinter query methods

[serhiy-storchaka]

The winfo_exists(), winfo_ismapped() and winfo_viewable() methods of tkinter widgets and Text.edit_modified() now return a bool instead of an integer or, depending on wantobjects, a string.

These were the only boolean-valued query methods still returning int/raw; all the others (tk_busy_status(), winfo_isdark(), Text.compare(), edit_canundo()/edit_canredo(), the selection_present()/selection_includes() methods, the ttk Treeview predicates, etc.) already return a proper bool. The winfo_* methods have coerced the result to int since the initial revision of tkinter, predating the bool type.

Existing boolean-return tests that only checked truthiness (or compared to 0/1 with assertEqual) are tightened to pin the exact type with assertIs.

🤖 Generated with Claude Code

• Issue: Some tkinter query methods return int or a raw value instead of bool #153422

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #33514621 | 📁 Comparing fc4d6aa against main (cd9994e)

  🔍 Preview build  

3 files changed

± library/tkinter.html
± library/tkinter.ttk.html
± whatsnew/changelog.html

[bedevere-app]

GH-153439 is a backport of this pull request to the 3.15 branch.