gh-151678: Add tests for tkinter Misc, Wm and geometry manager methods

[serhiy-storchaka]

Cover previously-untested methods of the Misc, Wm, Pack, Place and Grid classes:

• a new WinfoTest class for the winfo_* query methods (class, name, parent, children, toplevel, visual and screen information, atoms, pointer and screen coordinates, fpixels, containing, interps, viewable), including the pre-existing winfo_rgb and winfo_pathname;
• in MiscTest: getint, getdouble, getvar, register, deletecommand, option_add/option_get/option_clear, nametowidget, the focus_*, grab_* and selection_own* methods, event_add/event_delete/event_info, and bell;
• in WmTest: title, geometry, minsize/maxsize, resizable, aspect, grid, positionfrom/sizefrom, focusmodel, iconname, client/command, overrideredirect, state (with withdraw and deiconify), frame, group, protocol and transient;
• the short-named aliases of the grid_*, pack_* and place_* geometry manager methods.

Platform-specific behavior (Windows, macOS/Aqua) is guarded where it differs from X11.

• Issue: Improve test coverage of tkinter #151678

[miss-islington-app]

Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15.
🐍🍒⛏🤖

[bedevere-app]

GH-151737 is a backport of this pull request to the 3.15 branch.

[bedevere-app]

GH-151738 is a backport of this pull request to the 3.14 branch.

[bedevere-app]

GH-151739 is a backport of this pull request to the 3.13 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot PPC64LE Fedora Stable LTO 3.13 (tier-2) has failed when building commit 232764e.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1492/builds/1237) and take a look at the build logs.
4. Check if the failure is related to this commit (232764e) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1492/builds/1237

Failed tests:

• test_tools

Summary of the results of the build (if available):

==

Click to see traceback logs

Note: switching to '232764e6078b7d6b21931a71cb22b2a226a365d4'.

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Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 232764e6078 [3.13] gh-151678: Add tests for tkinter Misc, Wm and geometry manager methods (GH-151732) (GH-151739)
Switched to and reset branch '3.13'

In function ‘hashtable_key_from_2_strings’,
    inlined from ‘_extensions_cache_find_unlocked’ at Python/import.c:1284:17:
Python/import.c:1197:5: warning: ‘strncpy’ output truncated before terminating nul copying as many bytes from a string as its length [-Wstringop-truncation]
 1197 |     strncpy(key, str1_data, str1_len);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Python/import.c:1183:27: note: length computed here
 1183 |     Py_ssize_t str1_len = strlen(str1_data);
      |                           ^~~~~~~~~~~~~~~~~
In file included from ./Include/Python.h:14,
                 from ./Modules/_testexternalinspection.c:53:
./pyconfig.h:1964:9: warning: ‘_POSIX_C_SOURCE’ redefined
 1964 | #define _POSIX_C_SOURCE 200809L
      |         ^~~~~~~~~~~~~~~
In file included from /usr/include/bits/libc-header-start.h:33,
                 from /usr/include/stdint.h:26,
                 from /usr/lib/gcc/ppc64le-redhat-linux/16/include/stdint.h:11,
                 from /usr/include/elf.h:24,
                 from ./Modules/_testexternalinspection.c:4:
/usr/include/features.h:319:10: note: this is the location of the previous definition
  319 | # define _POSIX_C_SOURCE        202405L
      |          ^~~~~~~~~~~~~~~
./pyconfig.h:1985:9: warning: ‘_XOPEN_SOURCE’ redefined
 1985 | #define _XOPEN_SOURCE 700
      |         ^~~~~~~~~~~~~
/usr/include/features.h:234:10: note: this is the location of the previous definition
  234 | # define _XOPEN_SOURCE  800
      |          ^~~~~~~~~~~~~

make: *** [Makefile:2252: buildbottest] Error 2