CreateDialog[DefaultButton, Modal -> True]
creates a modal
Dialog, one which needs to be closed before the front-end becomes available for further interaction.
Very useful. However
CreateDialog[DefaultButton, Modal -> True, WindowFrame -> "ThinFrame"]
Dialog which is not modal despite the
Modal option being given.
Why does this happen? What really determines that a dialog is modal?
keywords: FrontEnd, block, Dialog, Window, WindowFrame
Reported to WRI. Will keep you informed.
[CASE:2559336] Feedback/ Dialogs documentation status:
[...] I have forwarded a report of this to the appropriate people in our development team with the information you provided and included your contact information. [...] I have included a comment about modifying the documentation to give more explanation, as well. [...]