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Plank can be set unhidden by setting ~/.config/plank/dock/settings -> HideMode=X -> HideMode=0, but how to set the maximize action to the upper edge of plank like in OS X?
Screenshot of my plank:
Screenshot of OS X:
You achieve that result by setting the "Never hide" option in System settings > Desktop > Dock.
Go to System Settings -> Desktop -> Dock
Required, but never shown