Comment 16 for bug 1018215

Drag & drop operations in nautilus are also terminated if the mouse button is released at the same time the unity launcher performs its "fade" operation. A demonstration of this issue happens in this screencase (https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1060580/+attachment/3367038/+files/drag%20and%20drop.ogv from an unrelated bug, issue happens at the 32 second mark)

This can be demonstrated across the deaktop and between windows if the mouse button is released during the same fraction of a second the launcher fades. Since this corresponds to a relatively common speed I seem to move at I can have file move operations simple fail to happen up to four times in a row until I'm either faster than when the launcher fade begins or slower than when it ends. In other words if the "hijacking" occurs during the same time I release my mouse button nautilus has no idea where I dropped the file since my mouse has "left" the program's window. If this description is unclear I can try creating a screencast that demonstrates the issue more clearly in Nautilus.

This happened for me under Precise and is still happening under Quantal.