Fixes #9196. This is a minor behaviour change as well, as clicking in the body won't unfocus the search bar. But I don't think that's a bad thing.
Fix "Install from URL" issue
@MarcelGerber Is the tabIndex stuff even needed? In my testing, everything seems to work fine if you remove all the tabIndex attributes and just leave the one no-focus class.
Remove tabindex, Apply .no-focus to the whole dialog
You're right. I now applied the no-focus class to the whole dialog, so that header and footer can't be focused either.
Looks good. Merging.