@Override
	public void rememberProject(ProjectLocator projectLocator) {
		if (!recentlyOpenedProjectsList.contains(projectLocator)) {
			addProjectToList(recentlyOpenedProjectsList, projectLocator);
			updatePreferences();
		}
	}
Keep the specified project on the list of known projects.
Ghidra/Framework/Project/src/main/java/ghidra/framework/project/DefaultProjectManager.java