If you drag a file from nautilus to a minimized app in your taskbar, then hold it above the minimized app, then it pops up allowing you to drop it in the app. This is a handy behavior that power users of Windows know. It currently fails in GNOME if the windows are grouped into groups, like if you have too many windows of the same application running. markmc said that this belongs in tasklist.c of libwnck.
Not easy to fix. Popping up the menu would require mouse and keyboard grabs, but the mouse is already grabbed by the drag source.
so we could just not grab the mouse and keyboard when the menu pops up and instead just automatically close the menu when the user does a drop, i think. Seems relatively hard though, and it's not that big of a deal. We should file it upstream and drop from target list. Warren can you file it upstream? Thanks.
Luckily, there already was an upstream bug, so we can forgive Warren his negligence...