public static void addSourceRoot(
final ModuleRootManager manager, @NotNull final VirtualFile root) {
final ModifiableRootModel model = manager.getModifiableModel();
ContentEntry contentEntry = findContentEntryForRoot(model, root);
if (contentEntry == null) {
contentEntry = model.addContentEntry(root);
}
contentEntry.addSourceFolder(root, false);
model.commit();
}
