Action buttons in the footer of a ProcessDialog showing an error are still clickable. Clicking the action results in weird and funny things happening, in particular the error message is not closed.
They used to be unclickable, here's a random old version of the demo you can confirm this with: https://doc.wikimedia.org/oojs-ui/v0.12.8/demos/#dialogs-mediawiki-mixed-ltr
For example:
- "Broken dialog (error handling)" example in the demos:
- Save dialog in VisualEditor: