Steps to create a zombie panel entry: Enable the panel's "Draw window frame when hovering a button" option. Put the focus on an instance of XFCE's Terminal, then hover the mouse over its entry in the Panel, press Ctrl-D to close Terminal (don't move the mouse), and the zombie Terminal entry stays in the panel, rather than closing as it should. This bug only occurs when the "Draw window frame when hovering a button" option is enabled.
(In reply to comment #0) > Steps to create a zombie panel entry: > > Enable the panel's "Draw window frame when hovering a button" option. > > Put the focus on an instance of XFCE's Terminal, then hover the mouse over its > entry in the Panel, press Ctrl-D to close Terminal (don't move the mouse), and > the zombie Terminal entry stays in the panel, rather than closing as it should. > > This bug only occurs when the "Draw window frame when hovering a button" option > is enabled. This is happening for me as well. xfce4-panel-4.8.2.
Fixed in 9081940.