Comment 5 for bug 792058

Attached a plugin that does a check on changes in the folder + parent folders every time a page is opened or reloaded. Please test it and report here if it works and especially how it works on large notebooks. I deliberately made it so that it will introduce some lag when scaling is not good - so you will notice.

1/ only detects new / missing files, but not changes in content (content is detected when the changed page is opened or reloaded)
2/ completely passive, so no timer or notification used, just triggered on the user action
3/ checks current page namespace and parents - so updates in root should always be detected, sub-trees only when accessed