By "jitter" I mean the visual effect of 2 different subs trying to move the scrollbar to different points. If you watch it, the scrollbar handle will look like a little Mexican Jumping bean. :-) Here is an example. First the test script, followed by the Tk code. 
###  test script
#!/usr/bin/perl
use warnings;
use strict;
$|++;
for (1..10000){
 print "$_\n";
 select(undef,undef,undef,.1);
}
__END__

########################################
#!/usr/bin/perl -w
use Tk;
use Tk::ExecuteCommand;
use strict;

my $mw = MainWindow->new;

#create and hide toplevel############ 
my $tl = $mw->Toplevel();
$tl->withdraw;
my $snaptext = $tl->Scrolled('Text',
                 -background=>'lightsteelblue',
                 -foreground=>'black',
                 )->pack();
$tl->Button(-text =>'Close',
             -command => sub{$tl->withdraw })->pack();
####################################### 

my $ec = $mw->ExecuteCommand(
-command    => '',
-entryWidth => 50,
-height     => 10,
-label      => '',
-text       => 'Execute',
)->pack;

my $dtext = $ec->Subwidget('text');

$dtext->configure( -background => 'black',
-foreground => 'yellow',
);

$mw->Button(-text => "Snap Shot",
    -command => sub{
             my $time = localtime;
             my $gettext = $dtext->get('end -10 lines', 'end');
             $snaptext->insert('end',"\n##$time\n$gettext\n###end time
+\n");
             $snaptext->see('end');
             $tl->deiconify;

             })->pack();


$ec->configure(-command => './test');
$ec->execute_command;
MainLoop;

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I'm not really a human, but I play one on earth. flash japh

In reply to Re^3: Tk::ExecuteCommand stop scrolling by zentara
in thread Tk::ExecuteCommand stop scrolling by dzon

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