public static void removeSourceRoot(Module module, VirtualFile root) {
   ModuleRootModificationUtil.updateModel(
       module,
       model -> {
         ContentEntry entry = findContentEntryWithAssertion(model, root);
         for (SourceFolder sourceFolder : entry.getSourceFolders()) {
           if (root.equals(sourceFolder.getFile())) {
             entry.removeSourceFolder(sourceFolder);
             break;
           }
         }
       });
 }
  private static void removeSourceRoot(@NotNull Module module, @NotNull final VirtualFile root) {
    final ModifiableRootModel model = ModuleRootManager.getInstance(module).getModifiableModel();
    final ContentEntry contentEntry = findContentEntryForRoot(model, root);

    if (contentEntry != null) {
      for (SourceFolder sourceFolder : contentEntry.getSourceFolders()) {
        if (sourceFolder.getFile() == root) {
          contentEntry.removeSourceFolder(sourceFolder);
        }
      }
    }

    ApplicationManager.getApplication()
        .runWriteAction(
            new Runnable() {
              @Override
              public void run() {
                model.commit();
              }
            });
  }