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A tooltip for panel applets. This is displayed above/below the panel instead of at exactly the mouse position to avoid covering the applet.
It is possible that panelItem is not an applet, but a child of an applet. An immediate example is for use in the window list, where each individual item, instead of the applet, has its own tooltip. These objects must have panelItem._applet set as the actual applet, since we need to access the applet to listen to orientation changes.
_init (Applet.Applet panelItem,string initTitle,St.Side orientation);
It should be noted that panelItem is the applet owning the tooltip, while that usually passed to Tooltips.Tooltip is the actor. These are different objects.