bpo-43655: Tkinter and IDLE dialog windows are now recognized as dialogs by window managers on macOS and X Window (#25187)

Lib/tkinter/filedialog.py

@@ -24,6 +24,7 @@ from tkinter import (
 )
 from tkinter.dialog import Dialog
 from tkinter import commondialog
+from tkinter.simpledialog import _setup_dialog
 
 
 dialogstates = {}
@@ -62,6 +63,7 @@ class FileDialog:
         self.top = Toplevel(master)
         self.top.title(title)
         self.top.iconname(title)
+        _setup_dialog(self.top)
 
         self.botframe = Frame(self.top)
         self.botframe.pack(side=BOTTOM, fill=X)

Lib/tkinter/simpledialog.py

@@ -40,6 +40,9 @@ class SimpleDialog:
         if title:
             self.root.title(title)
             self.root.iconname(title)
+
+        _setup_dialog(self.root)
+
         self.message = Message(self.root, text=text, aspect=400)
         self.message.pack(expand=1, fill=BOTH)
         self.frame = Frame(self.root)
@@ -115,6 +118,8 @@ class Dialog(Toplevel):
         if title:
             self.title(title)
 
+        _setup_dialog(self)
+
         self.parent = parent
 
         self.result = None
@@ -252,6 +257,13 @@ def _place_window(w, parent=None):
     w.wm_deiconify() # Become visible at the desired location
 
 
+def _setup_dialog(w):
+    if w._windowingsystem == "aqua":
+        w.tk.call("::tk::unsupported::MacWindowStyle", "style",
+                  w, "moveableModal", "")
+    elif w._windowingsystem == "x11":
+        w.wm_attributes("-type", "dialog")
+
 # --------------------------------------------------------------------
 # convenience dialogues