ContentArea fails to focus on textWithLinks when open in a dialog as floating editor

Description

Repo steps:
1. Open a page with content area (no child) inside in Edit mode
2. On page editing, click on that content area, a dialog will open
3. An AJAX request will be sent to server to get all available content types (e.g: /EPiServer/cms/Stores/contenttype/?query=getavailablecontenttypes&localAsset=true&parentReference=120_124&requestedTypes=episerver.core.blockdata&dojo.preventCache=1527503651820)
4. If that AJAX request is taking too long to response (more than 350ms) for some reason (e.g: too many content types or network is too slow), after that, there is no way to close the dialog