https://github.com/python/cpython/commit/173dabeab84a5f4575d9d599f811280a4a8409d3
commit: 173dabeab84a5f4575d9d599f811280a4a8409d3
branch: 3.15
author: Victor Stinner <[email protected]>
committer: vstinner <[email protected]>
date: 2026-10-16T10:41:48Z
summary:

[3.15] gh-159517: Modernize tkinter.simpledialog (#159518)

gh-159517: Modernize tkinter.simpledialog

No longer call ::tk::unsupported::MacWindowStyle on Tcl 9.1 and
newer.

Co-authored-by: Serhiy Storchaka <[email protected]>

files:
M Lib/tkinter/simpledialog.py

diff --git a/Lib/tkinter/simpledialog.py b/Lib/tkinter/simpledialog.py
index b9710a98ed0b92b..5c49d6c00f338a6 100644
--- a/Lib/tkinter/simpledialog.py
+++ b/Lib/tkinter/simpledialog.py
@@ -262,8 +262,11 @@ def _place_window(w, parent=None):
 
 def _setup_dialog(w):
     if w._windowingsystem == "aqua":
-        w.tk.call("::tk::unsupported::MacWindowStyle", "style",
-                  w, "moveableModal", "")
+        if w.info_patchlevel() >= (9, 1):
+            w.wm_attributes(stylemask='titled')
+        else:
+            w.tk.call('::tk::unsupported::MacWindowStyle', 'style',
+                      w, 'moveableModal', '')
     elif w._windowingsystem == "x11":
         w.wm_attributes(type="dialog")
 

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