[folding] region ranges not restored when editor is opened the first time.

<!-- ⚠️⚠️ Do Not Delete This! feature_request_template ⚠️⚠️ --> <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- Please search existing issues to avoid creating duplicates. --> <!-- Describe the feature you'd like. --> I would like it if the editor can remember the folding state of my code so when the file/project is opened the next day, the regions are in the state i left them.