Backport !815 “gs-updates-page: Refresh "Last checked:" information periodically” to gnome-40 (!830) · Merge requests · GNOME / gnome-software

Helps to keep the information up to date when the user lefts the window open at the Updates page.

(Minor fixes for cherry-pick conflicts due to not using libhandy in gnome-40.)

Not-quite trivial backport of !815 (merged) to gnome-40: I had to port the code from using libhandy to using GTK. Could do with some quick review.

Backport !815 “gs-updates-page: Refresh "Last checked:" information periodically” to gnome-40