private void undo() throws Exception {
		runSwing(() -> {
			try {
				program.undo();
				program.flushEvents();
			}
			catch (Exception e) {
				failWithException("Exception performing undo", e);
			}
		});
		waitForTasks();
		waitForTree();
	}
Tests for managing categories through the data manager plugin and tests for
actions being enabled when a node is selected.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/datamgr/DataTypeManagerPluginTest.java