Unity intercepts drag and drop file uploads to webpages

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http://askubuntu.com – Just asking if someone out there has seen the same quirk: If I want to drag a file to a dropzone in a website (say gmail's compose interface) Unity brings up the window picker bar (Launcher) and I can't drop the file in the webpage. It's like nothing happens. I haven't seen if it happens in Firefox too, just tried it with Chrome. (HowTos)