How to keep a Tkinter-Dialog on top of all other windows?

[Jeff Epler]

my similar code here use HWND_TOPMOST.  This is apparently different
from HWND_TOP:

    HWND_TOP 
     Places the window at the top of the Z order. 
      
    HWND_TOPMOST 
     Places the window above all non-topmost windows. The window maintains
     its topmost position even when it is deactivated

as far as I know, this code works right with only one call, not a call
from a timer.

Jeff