Improve layout of login window when adding web content

[LindsayRaabe_FPCWA]

When adding a web service, I get the login window appear asking for my username and password to access the service. What is annoying and needs improvement is the Adding data progress/loading window appearing over the top of the login window and sitting there until the credentials have been added. 

LindsayRaabe_FPCWA_0-1654567556382.png

It would make more sense if the Adding data window appeared behind the login window (I have to drag it out of the way to see what I have typed).