Bugs item #645964, was opened at 2002-11-29 22:25
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=645964&group_id=10894

Category: 02. Event Loops
Group: 8.4.1
> Status: Closed
> Resolution: Invalid
Priority: 5
Submitted By: Georgios Petasis (petasis)
Assigned to: Jan Nijtmans (nijtmans)
> Summary: "update idle" fails to redraw tk windows

Initial Comment:
There seems to be an annoying problem with the
"update idletasks" option of the update command.
While this command is supposed to redraw windows,
in the recent versions of tcl it does not. Consider for 
example the following small script:

pack [label .x -text label]

for {set i 0} {$i <= 100000} {incr i} {
  ## This will at least redraw the windows...
  .x configure -text "Count: $i"
  update idletasks
}

The behaviour of the above script is very strange.
In my windows XP machine, the above script only
updates the label widget (where its text changes) and
the rest of the . window is not painted at all,
showing the desktop part that was beneath the
window at its creation time. If you move a window
and pass it over the . window, it turns white,
the label does not visually update any more and even 
when the computation is finished, the window remains
white. You have to interact with the window (i.e.
by moving it) to be drawn.

----------------------------------------------------------------------

> Comment By: Jeffrey Hobbs (hobbs)
Date: 2002-11-30 12:58

Message:
Logged In: YES 
user_id=72656

update idle is doing exactly what you tell it to - only servicing 
the idle tasks.  If you want the other behavior, use 'update' 
without any arguments.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=645964&group_id=10894


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