0fded45c76
The event passed to formatEventTime() is reused at a later point. Therefore, we are not allowed to manipulate the event directly. This fixes an issue where the user clicks on a multi-day all-day event the second time before the event gets garbage collected and the event then is one day shorter. Fixes 528ee01fef6e5ca2303fc766be29a854d8ee928b Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2184>