The people who introduced this code were not careful enough to
make sure the code they removed from GcalWindow was added back
in GcalToolbarEnd.
They also simply commented out some code instead of properly
reimplementing that.
I regret having trusted their code :(
Closes https://gitlab.gnome.org/GNOME/gnome-calendar/-/issues/880
For the sake of smooth adaptivity, we need the toolbar buttons
to be constant in both modes instead of moving places from one
mode to another. Instead of duplicating these groups of
buttons, we can refactor them into an object for toolbars
and use them in multiple places.
This commit takes the widgets from the end of the header bar and
creates `GcalToolbarEnd`, which is used in the header bar and the
mobile action bar.
Georges Basile Stavracas Neto