Some elements in calendar popup don't stay in the same place

[Michal Predotka]

Ubuntu 17.10 Beta running live from USB

Steps to reproduce:
1. Click the time indicator in the top centre of the screen
2. Move between months in the calendar popup

Expected result:
View changes without visual glitches

What happens instead:
Sometimes both the "No event" icon and the vertical divider move right and left on the screen

Short video attached.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Didier Roche-Tolomelli (didrocks)]

Thanks for reporting this bug and help making ubuntu better!

I don't know if this bug is special to the ubuntu session or related to the gnome-shell itself. Something to check:
- installing the gnome vanilla session (sudo apt install gnome-session), reboot and switch to the "GNOME" session in GDM.
- you should have the Adwaita theme there. Check if you can reproduce the bug
- please report here if you can reproduce it. If there is a bug in that session, do you mind filing the bug against upstream bugzilla in gnome-shell?