gs-details-page: Don’t show the origin box if not on the details page

The different repos an app can be installed from are loaded asynchronously, but the widget for them (the origin box) is in a global header bar. That means it’s possible for the asynchronous load to complete after the user has switched away from the app details page, but for the origin box to then still be shown.

Fix that by only showing the origin box if the details page is still active when the asynchronous load completes.

Signed-off-by: Philip Withnall pwithnall@endlessos.org

Fixes: #988 (closed)