gh-159517: Do not use ::tk::unsupported::MacWindowStyle in IDLE on Tk 9.1 (GH-159527)

Tk 9.1 no longer provides this command.  Use "wm attributes -stylemask
docmodal" instead, as Tk itself does for its balloon window.  The calls
were silently ignored, so the completion list and the call tip could
grab the focus on macOS.
(cherry picked from commit e5ef47e)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Author: serhiy-storchaka

Lib/idlelib/autocomplete_w.py

@@ -185,12 +185,14 @@ def show_window(self, comp_lists, index, complete, mode, userWantsWin):
         self.autocompletewindow = acw = Toplevel(self.widget)
         acw.withdraw()
         acw.wm_overrideredirect(1)
-        try:
+        if acw._windowingsystem == 'aqua':
             # Prevent grabbing focus on macOS.
-            acw.tk.call("::tk::unsupported::MacWindowStyle", "style", acw._w,
-                        "help", "noActivates")
-        except TclError:
-            pass
+            if acw.info_patchlevel() >= (9, 1):
+                acw.update_idletasks()
+                acw.wm_attributes(stylemask='docmodal')
+            else:
+                acw.tk.call('::tk::unsupported::MacWindowStyle', 'style',
+                            acw._w, 'help', 'noActivates')
         self.scrollbar = scrollbar = Scrollbar(acw, orient=VERTICAL)
         self.listbox = listbox = Listbox(acw, yscrollcommand=scrollbar.set,
                                          exportselection=False)

Lib/idlelib/tooltip.py

@@ -30,14 +30,15 @@ def showtip(self):
         self.tipwindow = tw = Toplevel(self.anchor_widget)
         # show no border on the top level window
         tw.wm_overrideredirect(1)
-        try:
-            # This command is only needed and available on Tk >= 8.4.0 for OSX.
-            # Without it, call tips intrude on the typing process by grabbing
-            # the focus.
-            tw.tk.call("::tk::unsupported::MacWindowStyle", "style", tw._w,
-                       "help", "noActivates")
-        except TclError:
-            pass
+        if tw._windowingsystem == 'aqua':
+            # Without this, call tips intrude on the typing process by
+            # grabbing the focus.
+            if tw.info_patchlevel() >= (9, 1):
+                tw.update_idletasks()
+                tw.wm_attributes(stylemask='docmodal')
+            else:
+                tw.tk.call('::tk::unsupported::MacWindowStyle', 'style',
+                           tw._w, 'help', 'noActivates')
 
         self.position_window()
         self.showcontents()

Misc/NEWS.d/next/IDLE/2026-10-16-15-12-36.gh-issue-159517.uzRtAd.rst

@@ -0,0 +1,2 @@
+Fix the completion list and the call tip grabbing the focus on macOS with
+Tcl/Tk 9.1.