private void clearFocusedComponent() {
		if (focusedPlaceholder != null) {
			lastFocusedPlaceholders.remove(focusedPlaceholder);
			focusedPlaceholder.setSelected(false);
			WindowNode topLevelNode = focusedPlaceholder.getTopLevelNode();
			if (topLevelNode != null) {
				topLevelNode.setLastFocusedProviderInWindow(null);
				root.notifyWindowFocusChanged(topLevelNode);
			}
		}

		focusedPlaceholder = null;
		setNextFocusPlaceholder(null);
	}
Clears the docking window manager's notion of which component placeholder is focused. This
is used when a component is removed or component placeholders are rebuilt.
Ghidra/Framework/Docking/src/main/java/docking/DockingWindowManager.java