Tab jump behind Save file popup

[AlexAti]

When the Save file popup is open, and focus is on the popup, hitting Tab jump to the next editable element, which is inside the worksheet and behind the popup.

This is a nasty behaviour as I could mistakenly edit the contents of the file, and then click on the popup and save the document with errors. Also, the fact that there's a translucent overlay on top of the worksheet makes this error more difficult to notice.

I would advise to either not allow the focus jump, or quit the popup when doing so.