Implement “warning: metered connection” dialogue when manually checking for updates or installing software
Implement the “warning: metered connection” dialogue from the top of https://gitlab.gnome.org/Teams/Design/software-mockups/blob/master/updates-dialogs.png, which will be shown when the user’s on a metered connection and clicks on the ‘update’ button to manually check for updates.
Also for when the user is downloading software as part of installing it. See: #720 (comment 930376)
This is a follow-up to !339 (comment 671760).
Edited by Philip Withnall