Patch #1538878: Don't make tkSimpleDialog dialogs transient if

the parent window is withdrawn. This mirrors what dialog.tcl
does.
Will backport to 2.5.

Lib/lib-tk/tkSimpleDialog.py

@@ -46,8 +46,13 @@ class Dialog(Toplevel):
             title -- the dialog title
         '''
         Toplevel.__init__(self, parent)
-        self.transient(parent)
 
+        # If the master is not viewable, don't
+        # make the child transient, or else it
+        # would be opened withdrawn
+        if parent.winfo_viewable():  
+            self.transient(parent)
+ 
         if title:
             self.title(title)
 

Misc/NEWS

@@ -98,6 +98,9 @@ Core and builtins
 Library
 -------
 
+- Patch #1538878: Don't make tkSimpleDialog dialogs transient if
+  the parent window is withdrawn.
+
 - Bug #1597824: return the registered function from atexit.register()
   to facilitate usage as a decorator.