Opera drag&drop problem

[Mangatt]

Hello,
there seems to be issue in Opera with drag&drop file upload: if you try to drop files several times to browser, Opera always add files but sometimes show download dialogs for all dropped files.

I am using just basic plugin, but this issue can be reproduced even in the demo ( http://blueimp.github.com/jQuery-File-Upload/ ), just select few files and drag then repeatedly into Opera (without submit or cancel, just adding to queue). I've notice that if you drag more files error is more common: with single file is very rare but with 10 files (6MB each) is quite common.

Problem is that this issue seems to be completely random, sometimes are 30 drops ok (with same files and same page without reload or new plugin initialization) and sometimes is every second or third drop problematic.

[Mangatt]

This error is reproducible even with disallowed filetype, mp3 for example. Trying to reproduce this error with images (and image processing) can be really slow.

[blueimp]

I can confirm this issue.
However, this seems to be a browser bug affecting the latest version of Opera (tested with Opera 12.14).
I could also reproduce this issue on the following demo, unrelated to the File Upload plugin:
http://html5demos.com/file-api

[butch2k]

There are several issues with Opera Drag/Drop, this one which is very tricky and the fact that you can't drop on any input text or textarea (and checkbox/radio IIRC) else the files open up in the browser.