I can confirm this behaviour on an up-to-date feisty using the above steps:
Window manager warning: Invalid WM_TRANSIENT_FOR window 0x5c specified
for 0x1e0012b ().
** Changed in: gnome-applets (Ubuntu)
Status: Unconfirmed => Confirmed
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Empty wastebasket generates WM_TRANSIENT_FOR window manager warning
https://launchpad.net/bugs/91576
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