Ok, I have a better description of the issue.
The report says when this blue cursor appears, the ui is stuck. In fact this blue cursor is not focus in the editor but below (not really sure of that is below. The reporter says he can move the blue cursor) on an undefined text zone. The minimize-editor arrow works, but it doesn’t solve the issue.
@SnapGravy Is it detailed enough to create an issue on the github repo ?