Latest nightly, Opera has finally ceased to crash when hitting "Delete Post", but there is a minor inconsistency in the iframe, which is worth looking into. See:
http://www.schestowitz.com/temp/wordpress/opera-upload-bar.png
http://www.schestowitz.com/temp/wordpress/firefox-upload-bar.png
Proposed fix:
In wp-admin/inline-uploading.php
Replace
body {
font: 13px "Lucida Grande", "Lucida Sans Unicode", Tahoma, Verdana;
border: none;
margin: 0px;
height: 150px;
background: #dfe8f1;
}
With:
body {
font: 13px "Lucida Grande", "Lucida Sans Unicode", Tahoma, Verdana;
border: none;
margin: -6px;
height: 150px;
background: #dfe8f1;
}
Issue with horizontal scroll bar crops up, but #uploading in wp-admin/wp-admin.css might need slight modifications.