Closing the browser-login popup while the install-progress popup was
still up restored the main window the login had hidden, even though the
install popup was meant to own the screen until it finished. The owner
tag on each hidden entry only stops a popup from restoring another's
windows; it says nothing about what to do with its own when a second
popup still covers them.
Track which popups currently own the screen and, on restore, re-tag the
entries another live popup covers to that popup instead of showing them.
A popup is never handed its own window, so closing the popup on top still
brings the one below back.
Zoltán Papp
2ddcf3b921