@Override
			public void componentHidden(ComponentEvent e) {
				if (activeHoverService != null) {
					activeHoverService.componentHidden();
				}
			}
Sets the object that decides where to place the popup window. 
@param popupWindowPlacer the placer
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/hover/AbstractHoverProvider.java