Some default values differ between classic and normal sessions. We
used to implement this by overriding the shell's default values in
mini-extensions (or more precisely: reversing the shell's overrides).
Use a mode-specific overridesSchema instead, which has the advantage
that settings defaults will not change unexpectedly when extensions
are disabled/enabled (for instance during screen locks).
https://bugzilla.gnome.org/show_bug.cgi?id=701717
Classic mode should be visually distinct from the normal session,
so provide a mode-specific stylesheet which looks closer to the
familiar GNOME2 default theme.
https://bugzilla.gnome.org/show_bug.cgi?id=693169
With new items being added on the left, the top bar gets a little
crowded with the dateMenu at the center, so move it to its "classic"
position on the right.
https://bugzilla.gnome.org/show_bug.cgi?id=692016