The only output to a file you have here is:

               $dst ||= "$0.edit";  #in case user hits cancel 
               warn "dst=$dst";

         open (my $fh, '>',$dst) or die "$!\n";
         print $fh $sublable->get("1.0","end");
[download]

Your original file is only read:

   my $fh;
   open( $fh, '+<', "./test.txt" ) or die $!;
   my @contents = <$fh>;
#   print "@contents\n";
   close( $fh );
[download]

Meaningful variable names would probably help you.

Update:

There may also be a problem here:

            my $dst  = $mw->getSaveFile(
            -initialdir       => $ENV{HOME},
            -defaultextension => '.in',
             -title            => 'Save',
            -filetypes        => [
                [ 'myfiles'    => '.in' ],
                [ 'All files' => '*'    ],
            ],
            );
[download]

Please post the output from your code. My problems in determining what's going wrong here stem from:

• Opening the original file (./test.txt) in read-write (+<) mode but then only reading it.
• Whether you're experiencing some confusion with using my $fh twice.
• Your original file is in the current directory (./) but you're specifying -initialdir       => $ENV{HOME}. What's the full pathnames of these?
• The extension of your original file is .txt but you're specifying -defaultextension => '.in'
• Your zig-zag indentation style doesn't help much either.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.