The overview is one of the defining features of GNOME 3, and thus
almost by definition at odds with the classic session, which
emulates a traditional GNOME 2 desktop.
Even with the less prominent placement inside the application menu
it never quite fit in - it doesn't help that besides the different
UI paradigma, the overview keeps its "normal" styling which differs
greatly with classic's normal mode.
So besides removing the "Activities" button via the session mode
definition, now that the apps-menu extension doesn't replace it anymore,
disable the overview completely in the classic session.
https://gitlab.gnome.org/GNOME/gnome-shell-extensions/merge_requests/69
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
Florian Müllner
Giovanni Campagna