It's hard to say whether it's a bug or not, but I see your problem. In the perldoc for Tk::Text, it says the text behaves as normal, but what is normal?

-elide => boolean
 Elide  specifies whether the data should be elided.  Elided data is
 not displayed and takes no space on screen,  but  further  on
behaves just as normal data.
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I would say you could submit a bug report at Tk bug reports . But to be honest, the maintainer is very busy, and I wouldn't expect a quick response.

Your best option is to create a workaround, where you store the hidden ranges in an array

sub hide_text {  
   my @r = $text->tagRanges('sel'); 
   print "@r\n"; 
   return unless @r; 
   $text->tagAdd('hide',@r); 
   return;   
}
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then when the cursor position is in one of those ranges, manually skip it. This would require you bind to the arrow-keys. You might also want to ask in the newsgroup comp.lang.perl.tk, where a few Tk::Text experts hang out.