@Override
	public void rememberViewedProject(URL url) {
		if (!recentlyViewedProjectsList.contains(url)) {
			recentlyViewedProjectsList.add(0, url);
			if (recentlyViewedProjectsList.size() > RECENT_PROJECTS_LIMIT) {
				recentlyViewedProjectsList.remove(recentlyViewedProjectsList.size() - 1);
			}
			updatePreferences();
		}
	}
Keep the specified project on the list of known projects.
Ghidra/Framework/Project/src/main/java/ghidra/framework/project/DefaultProjectManager.java