Year view didn't have hints for days with events and this feature was
requested to be added to gnome-calendar.
This is an old request but in the past gnome-design team though it would
be better to keep the layout simple without hints for days with events.
Now with the changes in gnome-shell calendar and in order to keep them
in sync, this feature was added to gnome-calendar.
In order to implement this code we had to add a few css styles and a
code to add a small circle below everyday with events. Although
gnome-shell calendar uses an svg image with a 3x3 dot, we chose to use a
pango function to draw the dot.
https://bugzilla.gnome.org/show_bug.cgi?id=743317
Isaque Galdino
e8c75cea32