I also use Opera 10.10, I can regenerate your problem, but, unfortunately, I do not have a good / correct answer, but hack here. Do this if there is no other way . Put the following codes at the end of the document.
<script> x=document.getElementById("preview_desc"); x.innerHTML=x.innerHTML.replace(/(.)/g,"$1\u200b"); </script>
It will put a βZero Widthβ character after each character, so Opera will be able to handle this.
UPDATE : add only the long words currently set as 10+, you may need to edit it.
<script> x=document.getElementById("preview_desc"); x.innerHTML=x.innerHTML.replace(/[\w]{10,}/g,function(x){return x.replace(/(.)/g,"$1\u200b");}); </script>
YOU
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